Games Like They Are Billions

Diplomacy is Not an Option is a strategy game set in a medieval fantasy world. Build your town and defenses, raise huge armies and fight against massive hordes of enemies. How long can you survive?

Why similar: Colony Sim 26.4% ★, Base Building 20.8%, Zombies 15.3%, RTS 8.8%, Tower Defense 7%

Why You'll Like It: This is another fortress-building RTS where economy, walls, chokepoints, and huge enemy swarms create the same frantic hold-the-line tension.

Age of Darkness: Final Stand is a dark fantasy survival RTS where you must illuminate, build and defend humanity’s last bastion against hordes of Nightmares. Set in the remnants of a kingdom consumed by a deadly fog, you decide. Will you hide in the light? Or take back your world.

Why similar: Base Building 27.4%, RTS 22%, Tower Defense 18.4%, Survival 10.9%, Strategy 6.9%

Why You'll Like It: It is the closest modern counterpart to They Are Billions, built around expanding an RTS-style settlement and surviving massive nighttime hordes crashing into your defenses.

Design and build fortresses brick by brick to stand against endless hordes of Horrors in this real-time strategy game with resource management, siege defense, and exploration. Lead from the ramparts, push back the darkness, and hold fast against the creatures of the Mist.

Why similar: Colony Sim 16.3% ★, Base Building 13.1%, RTS 10%, Zombies 9.3%, Tower Defense 8.1%

Why You'll Like It: Its entire loop revolves around constructing layered fortifications and repelling overwhelming nightly assaults, capturing the defensive engineering side of They Are Billions.

Choose any real region from the world. Choose your base of operations, then rebuild and readapt the buildings around you to create a self-sustaining settlement. Take charge of a group of survivors from your city. And when the night falls - Defend the zone from the infected!

Why similar: Base Building 24.8%, Colony Sim 17.5% ★, Zombies 15.7%, RTS 11.7%, City Builder 10.1%

Why You'll Like It: It scratches the zombie-colony fantasy by letting you reclaim a city block by block, fortify buildings, and survive recurring undead pressure.

From the Command & Conquer veterans at Petroglyph comes the first ever survival RTS set in the savage world of Conan the Barbarian. Play solo or team up in multiplayer in Conan Unconquered’s action-packed co-op Mode where you build a shared stronghold and fend off the hordes together.

Why similar: RTS 28.6%, Base Building 18%, Strategy 15.9%, City Builder 14.2%, Tower Defense 12.5%

Why You'll Like It: It focuses on building and upgrading a vulnerable RTS base while defending against escalating waves, making it a very direct horde-survival alternative.

Build your defense base to fight back the undead hordes of Mars and secure the future of the red planet. MarZ is a game of strategy and tactical defense where you must carefully manage your crew and resources as you try to uncover the terrible secrets of the undead.

Why similar: Tower Defense 20.8%, RTS 20.3%, Base Building 19.5%, Zombies 17.4%, Strategy 8.5%

Why You'll Like It: It delivers a similar RTS-and-tower-defense blend where careful expansion and perimeter defense determine whether your colony survives.

Build, scavenge, craft, and perform occult rituals to survive in a demon-infested, post-apocalyptic colony simulation. Will you survive Judgment day?

Why similar: Colony Sim 34.1% ★, Base Building 24.8%, Survival 11.8%, Real-Time with Pause 6.3% ★, Post-apocalyptic 6.2%

Why You'll Like It: Although more colony-sim than RTS, it shares the same desperate loop of building a defensible outpost, managing scarce resources, and surviving apocalyptic attacks.

The Riftbreaker is a solo or Co-op base-building, survival game with Action-RPG elements for up to 4 players. Hack & slash countless hordes of enemies. Build up your base, craft powerful weapons and research new inventions to survive.

Why similar: Base Building 35%, Tower Defense 17.8%, RTS 17.3%, Survival 12%, Building 5.7%

Why You'll Like It: It pairs rapid base expansion with heavy turret-based defense against huge creature waves, giving you the same satisfaction of turning a hostile map into a fortress.

“Alien Marauder” is a real-time strategy game with survival and confrontation theme. In this game, you will be the leader to a treacherous alien planet, build and defend base to survive against the vexan waves. Make the right decision!

Why similar: Colony Sim 26.8% ★, Base Building 20.5%, RTS 17.2%, Tower Defense 11.2%, Survival 9.5%

Why You'll Like It: Its mix of RTS resource gathering, base construction, and defending against relentless alien swarms feels very close to They Are Billions in moment-to-moment play.

From Glory To Goo is a Sci-Fi survival RTS set on an alien world. Serve as humanity's bulwark by establishing a colony and supporting your colonists still in orbit. But beware, for The Goo, a relentless and shape-shifting force approaches from all sides, even above and below.

Why similar: Colony Sim 18.5% ★, Base Building 17.3%, RTS 13.1%, Tower Defense 10.8%, Zombies 9.7%

Why You'll Like It: It leans harder into RTS systems but still nails the formula of expanding a base under constant pressure and fortifying against overwhelming attacks.

Cepheus Protocol is an Open World RTS Military Survival Game. Play as the CERC hunting Patient 0, maintain Quarantine camps, fight dangerous mutations & Rogue Civilian Combatants . There’s nobody else coming, it’s up to you now.

Why similar: RTS 25.5%, Zombies 24%, Survival 14%, Base Building 11.6%, Post-apocalyptic 8.2%

Why You'll Like It: This is a real-time zombie strategy game with base-building and containment mechanics that echoes the outbreak-management side of They Are Billions.

The world after a nuclear war. Manage the settlement, learn technology, make decisions, produce weapons, ammunition, organize defense, raid for supplies on other areas, do not let residents die, survive the nuclear winter.

Why similar: Base Building 31.2%, RTS 10.7%, Strategy 10.5%, Survival 9.5%, Colony Sim 9.2% ★

Why You'll Like It: This post-apocalyptic colony builder shares the survival-against-collapse vibe, with settlement growth tightly tied to defensive preparedness.

A brutal godlike village sim that melds the god game, management, and tower defense genres! Fight off hoards of monsters at night, and expand your village in the day time. Inspired by games like Black and White, Rimworld, and Dwarf Fortress but not quite like any of them.

Why similar: Colony Sim 34.8% ★, Tower Defense 18%, Base Building 17.8%, City Builder 12.5%, Survival 9.1%

Why You'll Like It: Its hybrid of village management and tower-defense captures the same pleasure of growing a settlement while preparing for nightly onslaughts.

Survive and thrive in a post-apocalyptic future — resources are scarce, but opportunity calls! Build the ultimate disaster proof colony, protect your colonists, and restore civilization to a devastated world.

Why similar: Colony Sim 28.9% ★, Base Building 19.3%, City Builder 15%, Survival 12.2%, Strategy 8.9%

Why You'll Like It: It emphasizes post-apocalyptic colony survival and defensive planning, even if it is less combat-centric than They Are Billions.

In this city builder and tower defense game, you will command a small band of ship wrecked colonists. Progress from struggling to survive the elements to a thriving kingdom that will smash the demon hordes that dare attack your settlement.

Why similar: Colony Sim 35.3% ★, Tower Defense 20.5%, City Builder 14.4%, Survival 9.4%, Strategy 8.5%

Why You'll Like It: This is a strong fit if your favorite part of They Are Billions was building a settlement specifically to withstand recurring siege-like enemy waves.

Colony Survival is a unique first-person strategy game developed by a two-man team. Build your own colony in a voxel world. Command guards, farmers, miners and other colonists. Defend your colony against the horde of monsters that attacks every night!

Why similar: Colony Sim 35.5% ★, Base Building 23.7%, Survival 11.1%, Zombies 8.6%, City Builder 5.9%

Why You'll Like It: It turns the colony-sim side of They Are Billions into a first-person sandbox where nightly monster waves make walling off and defending your settlement essential.

Frostpunk is the first society survival game. As the ruler of the last city on Earth, it is your duty to manage both its citizens and infrastructure. What decisions will you make to ensure your society's survival? What will you do when pushed to breaking point? Who will you become in the process?

Why similar: Colony Sim 24.2% ★, City Builder 13.2%, Steampunk 11.9% ★, Survival 11.6%, Base Building 10.4%

Why You'll Like It: This is a great pick if what you loved most was the brutal survival-city-builder pressure and constant sense that one mistake can doom the colony.

Build a castle by day and defend it by night. Becastled blends cozy city-building with challenging tower defense strategy. Lead the Sun Kingdom’s last stand against the Moon Beasts and end the ancient conflict between light and darkness!

Why similar: Base Building 31.7%, Colony Sim 21.7% ★, RTS 15%, City Builder 11.3%, Strategy 7.4%

Why You'll Like It: If you enjoy the wall-building and siege-defense side of They Are Billions, this offers a lighter but very focused version of that loop.

Until We Die is a side-scrolling strategy game about defending your base where you have to run around as Ivan, assign tasks to people, and fight mutants in the post-apocalyptic subway!

Why similar: Base Building 26.2%, Colony Sim 25.6% ★, Tower Defense 14.8%, Survival 13.6%, Strategy 7.3%

Why You'll Like It: This is a smaller-scale take on surviving in a hostile world by expanding a defensible base and holding off waves with limited resources.

Endzone is a post-apocalyptic survival city builder, where you start a new civilization with a group of people after an ecological disaster. Build them a new home and ensure their survival in a shattered world, threatened by constant radiation, toxic rain, sandstorms and droughts.

Why similar: Base Building 22.8%, City Builder 19%, Colony Sim 18.4% ★, Survival 14.8%, Post-apocalyptic 8.5%

Why You'll Like It: It shares the harsh post-apocalyptic settlement-management feel, with survival pressure and long-term planning taking priority over direct RTS combat.

In a world overrun by the undead, build a lab to fight back with science. Manage survivors, gather vital resources, and turn zombies into allies. Defend your base and research the cure to reclaim humanity.

Why similar: Colony Sim 24% ★, Base Building 18.7%, Zombies 11.7%, Tower Defense 10.5%, Survival 8.2%

Why You'll Like It: It is more management-focused, but the zombie theme, settlement building, and defense-oriented progression make it a natural thematic match.

Build and manage your own castle settlement in a land reclaimed by wilderness. With detailed management, survival strategy, and a moddable sandbox world, Going Medieval challenges you to build the mightiest colony this side of the apocalypse.

Why similar: Colony Sim 35.6% ★, Base Building 28%, City Builder 13%, Survival 12.4%, Strategy 6.9%

Why You'll Like It: It offers the same satisfaction of designing a fortified settlement and preparing for raids, just in a more sandboxy colony-sim format.

A survival city-building game with flying cities. Build, automate, and defend a flying city that travels between procedurally generated maps to survive in a wacky, nightmare-infested, post-apocalyptic world full of strange science and dreams.

Why similar: Base Building 23.3%, City Builder 15.7%, Tower Defense 14.8%, Survival 14%, Steampunk 13.7% ★

Why You'll Like It: Its survival loop of building, relocating, and defending a vulnerable city against swarms offers a similarly high-pressure colony-defense experience.

Factorio is a game about building and creating automated factories to produce items of increasing complexity, within an infinite 2D world. Use your imagination to design your factory, combine simple elements into ingenious structures, and finally protect it from the creatures who don't really like you.

Why similar: Base Building 54.8%, Survival 11.7%, Resource Management 9.9%, City Builder 7.2%, Strategy 7.1%

Why You'll Like It: While more automation-heavy, defending an ever-expanding industrial base from swarming attackers taps into the same paranoia about perimeter integrity.

An open-ended factory management game with RTS and tower defense elements.

Why similar: Base Building 38.4%, Tower Defense 22.6%, RTS 11.4%, Strategy 7.9%, Resource Management 7.3%

Why You'll Like It: Its blend of base-building, logistics, RTS control, and wave defense makes it an excellent mechanical match if you loved the constant defensive pressure.

Brave a new world in Stranded: Alien Dawn, a planet survival sim placing the fate of a small marooned group in your hands. Forge your story through compelling and immersive strategic gameplay as you make vital decisions to protect your survivors.

Why similar: Base Building 38.4%, Colony Sim 28.9% ★, Survival 17.3%, Strategy 7.6%, Resource Management 3.5%

Why You'll Like It: Its colony survival gameplay rewards defensive layouts, resource triage, and weathering repeated external threats much like a slower-paced They Are Billions.

A sci-fi colony sim driven by an intelligent AI storyteller. Generates stories by simulating psychology, ecology, gunplay, melee combat, climate, biomes, diplomacy, interpersonal relationships, art, medicine, trade, and more.

Why similar: Colony Sim 38.8% ★, Base Building 29.6%, Survival 11.8%, City Builder 7.4%, Strategy 5.2%

Why You'll Like It: Even without the RTS structure, its colony management, killbox design, raid defense, and escalating disasters strongly appeal to the same defensive-builder mindset.

Defend the last bastion of humanity with your squad of heroes! Exterminate fiendish monsters with magic and brute force by night and re-build your battered city defenses by day in this tactical RPG with rogue-lite mechanics.

Why similar: Base Building 39.1%, Tower Defense 27.8%, Strategy 13.9%, Post-apocalyptic 10.3%, Tactical 7.4%

Why You'll Like It: It shifts to turn-based tactics, but the core fantasy of rebuilding a fragile haven and surviving gigantic nightly hordes is very much intact.

The unstoppable fluid enemy has returned and destroyed every world in its path! Defend against Creeper as it floods across the 3D terrain in this real time strategy game where the enemy is a fluid.

Why similar: RTS 37.3%, Tower Defense 33.2%, Building 12%, Strategy 11.4%, Tactical 4.4%

Why You'll Like It: Its real-time base expansion against an overwhelming, map-filling enemy force recreates the same strategic pressure of constantly securing territory before you are overrun.

IXION is an unrelenting, city-building odyssey across the stars. As Administrator of the Tiqqun, DOLOS’ prototype space station, you are tasked with balancing preservation and exploration as you manage infrastructure, resources and crew. Can you keep the flame of humanity alight in the cold dark?

Why similar: Colony Sim 28% ★, Base Building 19.8%, City Builder 14.4%, Survival 11.8%, Strategy 6.7%

A dark fantasy city builder where you must rebuild civilization in the face of apocalyptic rains. As the Queen’s Viceroy, lead humans, beavers, lizards, foxes, and harpies to reclaim the wilderness and secure a future for civilization's last survivors.

Why similar: Colony Sim 30.8% ★, Base Building 25.1%, City Builder 12.1%, Survival 10.6%, Strategy 6.4%

Develop, expand, and advance your city in a society survival game set 30 years after an apocalyptic blizzard ravaged Earth. In Frostpunk 2, you face not only the perils of never-ending winter, but also the powerful factions that watch your every step inside the Council Hall.

Why similar: City Builder 21.5%, Survival 18.3%, Base Building 11.9%, Colony Sim 10.7% ★, Strategy 10.6%

The Wandering Village is a city-building simulation game on the back of a giant, wandering creature. Build your settlement and form a symbiotic relationship with the colossus. Will you survive together in this hostile, yet beautiful post-apocalyptic world, contaminated by poisonous plants?

Why similar: Colony Sim 31% ★, Base Building 17.5%, RTS 14.4%, City Builder 13%, Survival 8.1%

Your village must survive for 13 days! Gather resources, expand, explore the underground for riches, and train soldiers to defend against hordes of the undead.

Why similar: Base Building 25.1%, Tower Defense 17.1%, RTS 15.5%, Zombies 14.1%, Survival 11.2%

Oxygen Not Included is a space-colony simulation game. Deep inside an alien space rock your industrious crew will need to master science, overcome strange new lifeforms, and harness incredible space tech to survive, and possibly, thrive.

Why similar: Colony Sim 40.9% ★, Base Building 30.8%, Survival 12.4%, Resource Management 4.9%, Building 4.6%

After a nuclear war life on the surface became impossible. A 300m thick radioactive fog covered the Earth. We are looking for bold active people to manage the process of restoring life on Earth. Join!

Why similar: Colony Sim 29% ★, Base Building 18.5%, City Builder 13.7%, Tower Defense 12%, Strategy 6.8%

After Long Night is a sandbox survival RTS. Build and fortify your base, scavenge every corner for vital resources, craft deadly weapons, and raise a militia to fight off relentless zombie hordes that strike every night. In this world, scavenging isn't just survival—it's strategy, power and war.

Why similar: Colony Sim 20.8% ★, Base Building 16.8%, RTS 13.7%, Zombies 12.3%, Tower Defense 7%

Humans are long gone. In a world struck by droughts and toxic waste, will your lumberpunk beavers do any better? A sandbox city-building game featuring ingenious animals, vertical architecture, water physics, and terraforming. Contains high amounts of wood.

Why similar: Colony Sim 32.8% ★, Base Building 22.7%, City Builder 15.4%, Survival 9.9%, Building 5.9%

New Cycle is a city building game with focus on survival. After an apocalyptic series of solar flares, human society has been thrown into disarray. Establish a settlement and develop it all the way from humble beginnings to industrial metropolis.

Why similar: Colony Sim 26% ★, Base Building 19.6%, City Builder 11%, Survival 9.9%, Real-Time with Pause 8.6% ★

Collect resources and establish a defense line before dark And then Facing countless enemies

Why similar: Base Building 30.1%, Tower Defense 28.4%, Survival 11.8%, Strategy 10.1%, Post-apocalyptic 8.1%

Build and design the terrain while defending your stronghold against alien invasion in this unique Roguelike tower defense. Choose from 30 heroes, survive enemy waves, and upgrade a variety of destructive towers to hold the line!

Why similar: Base Building 30.1%, Tower Defense 23.2%, RTS 22.1%, Strategy 7.9%, Building 5.9%

Guide a group of space settlers trying to establish a base on a remote planet. Grow food, collect energy, mine resources, survive disasters and build a self-sufficient colony in a harsh and unforgiving environment.

Why similar: Colony Sim 36.1% ★, Base Building 25.6%, City Builder 13.3%, Survival 9.7%, Strategy 5.5%

Command distinct factions in a desperate struggle for power and resources in Tempest Rising - a classic RTS set on Earth after a nuclear war.

Why similar: RTS 56.9%, Base Building 24%, Strategy 17%, Isometric 0.8%, Singleplayer 0.6%

Protolife is an unique tower-based strategy game which gives you a direct control over the builder robot in a struggle against the hungry proto-life organism.

Why similar: Base Building 35.9%, RTS 29.2%, Tower Defense 24.9%, Strategy 8.9%, Singleplayer 0.7%

Automate a lunar base as you become the savior of humanity exploring the future on the moon. Mine, craft, research, and trade resources with Earth in this gripping narrative basebuilder.

Why similar: Colony Sim 29.1% ★, Base Building 24.8%, RTS 10%, City Builder 9%, Survival 6.8%

Risen Kingdom is a real-time strategy game. Build and fortify your settlements to survive and push back armies of the undead.

Why similar: Base Building 22.4%, Colony Sim 19.3% ★, RTS 17.8%, Tower Defense 14%, Zombies 13.8%

Endzone 2 is a post-apocalyptic survival colony builder, where you embark to secure humanity's survival after a cataclysmic disaster. Discover and repopulate the last habitable grounds, while the survival of your people hinges on your wits, foresight, and resilience in a harsh and unforgiving world.

Why similar: Colony Sim 32.8% ★, Base Building 19.9%, City Builder 12.1%, Survival 11.1%, Post-apocalyptic 6.8%

Embark on a space voyage with your ragtag crew of civilians in search of a new home. Build spaceships tile by tile, create optimal gas conditions, manage the needs and moods of their crew, encounter other space-faring groups, and explore the universe in this spaceship colony simulation.

Why similar: Colony Sim 30.8% ★, Base Building 24%, Survival 10.7%, City Builder 10.2%, Strategy 5.8%

Create a sprawling industrial city. Compete with other rival corporations on Titan for resources, territory, and power. Seek victory via technology, influence, warfare, or the wealth extracted from your citizens. Stake your claim to the Industries of Titan in this innovative sim/strategy game!

Why similar: Colony Sim 29.3% ★, Base Building 21.4%, City Builder 12.4%, Real-Time with Pause 10.8% ★, Post-apocalyptic 6.2%

Deep Among the Swarm is a challenging survival RTS roguelite about surviving against thousands of enemies. Drill ever deeper underground while fighting the endless onslaught of the Swarm. Can you save humanity?

Why similar: Base Building 24.1%, RTS 19.8%, Tower Defense 15.1%, Survival 10.5%, Real-Time with Pause 9.3% ★

Protect and guide your people as you forge a town from untamed wilderness at the edge of the known world. Harvest raw materials, hunt, fish and farm to survive. Produce crafted items to trade, consume, equip and fight with as you battle for your survival against the elements and outside threats.

Why similar: Colony Sim 25% ★, Base Building 19.9%, RTS 15.8%, City Builder 11.6%, Survival 8.4%

Darfall is a hero-based RPG city-building game that puts you in the role of a hero who must protect their home and help it grow! During the day, grow your hero’s might, find epic loot, master new abilities, and fortify your settlement. At night, survive the hordes of undead, until you triumph.

Why similar: Base Building 20.8%, Colony Sim 20.2% ★, RTS 15.7%, Zombies 12.5%, City Builder 9.4%

Corporate greed meets strategic planet-mining in Drill Core! Drill to the heart of planets while managing workers, researching cutting-edge tech, and fortifying against alien attacks. Will you prioritize efficiency and risk your workers' safety, or focus on defense for survival?

Why similar: Colony Sim 34.3% ★, Base Building 22.3%, Tower Defense 17.5%, City Builder 11.2%, Strategy 7.6%

Here Comes the Swarm is a survival RTS with a pause button! Create your strategy, build, manage, and defend your settlements at your own pace. Take the fight to the hive mind and lead expeditions to deliver a deadly blow and eradicate your foes. Will you reclaim Ulora from the relentless Swarm?

Why similar: Colony Sim 23% ★, Base Building 18.9%, RTS 14.3%, Tower Defense 10.4%, Survival 8.6%

Can you rebuild civilisation after a zombie apocalypse? From the creator of Plague Inc. comes a unique blend of strategic simulation, survival city builder and ‘mini 4X’. Build settlements, harvest resources and shape society as you lead Humanity out of the darkness.

Why similar: Colony Sim 31.6% ★, Base Building 18.8%, Zombies 16.8%, City Builder 11.4%, Post-apocalyptic 6.3%

Command swarms of warriors at an unprecedented scale of warfare in this blend of RTS and base-building. Lead ant colonies against the many fearsome threats of the insect world, while building intricate nests, developing pheromone-based tactics, and evolving to meet growing dangers.

Why similar: Colony Sim 30.9% ★, Base Building 25.4%, City Builder 12.2%, Survival 10.4%, Strategy 6.5%

Final Outpost is a survival strategy base-builder. You lead the last survivors of the apocalypse. Assign roles, craft tools, and manage resources carefully. Construct buildings, level up your citizens, and fortify your town against hordes of zombies. How many days can you survive?

Why similar: Colony Sim 18.8% ★, Base Building 18.1%, Zombies 11.5%, RTS 11.2%, Tower Defense 8.7%

Last Outpost is a minimalist Base Building & Strategy game where you build and defend your outpost in zombie apocalypse. Choose your vehicle and loadout before embarking on your adventure. Use your abilities and control your units to eliminate all threats. Will you manage to defend your outpost?

Why similar: Base Building 23.7%, RTS 19.4%, Tower Defense 17.8%, Zombies 14.8%, City Builder 12%

Get ready for the ULTIMATE tower defense onslaught. Build, deploy, research and upgrade your defenses in this epic, old school RTS inspired sci-fi adventure.

Why similar: Tower Defense 29.9%, Zombies 23.5%, Survival 18.7%, Strategy 11.1%, Post-apocalyptic 7.6%