Games Like Onset

An open multiplayer sandbox game; includes tools, props, levels, NPCs, character models, game-modes and much more! Make your own using our mod kit!

ADVENTURE. ANYWHERE! Explore endless magical worlds and battle fearsome creatures alongside millions of friends. Ride your own horse, bear or moa and discover the many game world wonders. Unleash your imagination by crafting beautiful buildings.

Why similar: Massively Multiplayer 55.1%, RPG 15.6%, Open World 7.3%, Sandbox 6.5%, Action 6.1%

Dark and Light is a vast sandbox survival RPG set in a world dominated by powerful elemental forces. Find your way in a meticulously crafted world, featuring breathtaking landscapes, a wide variety of mythical creatures, and limitless possibility to craft, build, and unlock dozens of powerful weapons, spells, and skills.

Why similar: Massively Multiplayer 49%, Open World 14.8%, RPG 12.9%, Sandbox 12%, Multiplayer 4.1%

Project: Gorgon is a fantasy MMORPG that allows you to forge your own path through exploration and discovery.

Why similar: Massively Multiplayer 69.2%, RPG 17.3%, Indie 5.1%, Open World 4.7%, Sandbox 3.8%

Craft any magical spell you can imagine using the most powerful tool there is: code. CodeSpells is currently an unguided, sandbox experience for the bravest wizards who want to help the developers steer the game's development.

Why similar: Simulation 35.6%, Sandbox 29.6%, Indie 13.4%, Action 13.3%, Multiplayer 8.2%

Modbox is a multiplayer game creation sandbox for Desktop+VR

Why similar: Sandbox 25%, Open World 20.6%, Simulation 20%, Multiplayer 16.7%, Action 10.2%

Xsyon is a player driven apocalyptic fantasy sandbox MMORPG, set in a living and evolving environment. Players create the world they want to live in as they form tribes, construct towns, shape landscapes, create quests, hunt, farm, gather, build societies and develop a New World.

Why similar: Open World 28.1%, Sandbox 27.7%, RPG 20.1%, Simulation 15%, Action 9.1%

Screeps: World is an open source MMO strategy sandbox game for programming enthusiasts. You control your colony by writing JavaScript code that operates 24/7 in the huge persistent online open world.

Why similar: Massively Multiplayer 57%, Sandbox 15.8%, Open World 15.4%, Simulation 11.8%

Mortal Online is a first-person medieval fantasy MMORPG, set in a huge, open, unforgiving world. Choose your race, choose your playstyle, choose a profession, choose where to place your loyalties - if you have any...

Why similar: Massively Multiplayer 51.8%, Open World 15%, Sandbox 12.3%, RPG 9.9%, Multiplayer 5.2%

Nova-Life: Amboise is a multiplayer role-play simulation video game. Create your character and start your second life!

Why similar: Simulation 31.3%, Multiplayer 19.1%, Action 14%, Indie 10.8%, RPG 9.2%

Rising World is a voxel based open-world sandbox game, featuring a procedurally generated world, playable in single and multi-player.

Why similar: Sandbox 51.9%, Multiplayer 33%, Indie 15.2%

Plasma is a pure engineering sandbox. Use advanced visual programming and robotics tools to create anything you can imagine.

Why similar: Sandbox 43.5%, Simulation 37.2%, Open World 12.9%, Multiplayer 6.4%

Reveal company secrets while hacking and exploring their quantum simulation networks. Fights for control with other players, coop with your faction, gather best tools, build most secure servers, write scripts and webs, or choose to be solo hacker who makes the right choices to change the world.

Why similar: Massively Multiplayer 57.6%, Simulation 14%, Sandbox 13%, Open World 11%, Indie 4.4%

The incremental idle MMO where your heroes keep fighting while you're gone! Spend their loot on upgrades, unlock classes from Elemental-Wizard to Cannon-Pirate, and level 20 unique skills like Farming, Sailing, and Construction!

Why similar: Massively Multiplayer 43.8%, RPG 16.7%, Multiplayer 13.2%, Sandbox 12.4%, Simulation 10%

Join a world where you design, create and pilot your own air sea rescue service. Release your inner hero as you battle fierce storms out at sea to rescue those in need.

Why similar: Sandbox 44%, Open World 36.6%, Multiplayer 19.3%

Warning: This is an Early Access game! Welcome to an enigmatic world, where a new gaming experience in exploring, building and surviving is waiting just for you. Experience a sandbox world with survival elements, and join us in creating a full version of the game.

Why similar: Open World 24.1%, Sandbox 23.3%, RPG 20.8%, Simulation 18.9%, Action 7%

Azulgar: Star Commanders is a Sci-Fi open world sandbox game that puts you in a command of your own custom made space ship. Explore aftermath of the Azulgar event that reshaped the face of the solar system.

Why similar: Simulation 27.9%, Massively Multiplayer 22.9%, Action 16.8%, Indie 10.6%, RPG 8.5%

Adventure in a vast open-world survival craft game with your programmable sidekick Grammi! Program the Grammi to collect materials, build your town, craft weapons and armor to challenge strong enemies! Play alone or with friends online!

Why similar: Open World 23.7%, RPG 22.7%, Sandbox 17.9%, Multiplayer 17.9%, Action 11.2%

Wild Terra Online is a sandbox RPG, in a completely player-controlled medieval world. You will have to survive in a forest full of predators, build a shelter and improve your crafts skills, tame animals and fight for treasures. You can become anyone and do whatever you want!

Why similar: Massively Multiplayer 50.3%, RPG 13.9%, Sandbox 12.7%, Open World 11.5%, Multiplayer 4.7%

Replicube is an open-ended programming puzzle game/toy about writing code to replicate 3D voxel-based objects. Solve puzzles, pursue leaderboard glory, or just make art to share with the in-game community.

Why similar: Simulation 53%, Sandbox 47%

This massive online sandbox RPG features elements of magic, spellcasting, building, exploring and crafting. As a newly minted apprentice of the magic arts, you will set off to the dangerous world of Ignus. Tame mighty beasts, forge alliances, explore uncharted territories or fight for dominance!

Why similar: Massively Multiplayer 48.1%, Open World 16.2%, RPG 14.4%, Sandbox 9.7%, Multiplayer 5.3%

Playcraft is a multiplayer game-creation sandbox accessible to anyone!

Why similar: Massively Multiplayer 45.9%, Sandbox 13.3%, Open World 11.4%, RPG 10.6%, Multiplayer 8.5%

Welcome to a vast, social sandbox MMO inspired by the legends of the medieval era. Here, myths are real, ghosts exist, and magic is unquestioned. Join thousands of players as you explore the land, build your home, forge your reputation, and craft your own stories. What world will you make?

Why similar: Sandbox 27.8%, RPG 27.4%, Open World 27.1%, Multiplayer 17.6%

Mechanica is a multiplayer open-world survival game involving building and programming. Create your own bases, defenses, manufacturing systems and more. Explore the map and expand the scope and complexity of your creations.

Why similar: Sandbox 47.5%, Indie 23.3%, Multiplayer 15.6%, Action 13.5%

Grey Hack is a massively multiplayer hacking simulator game. You're a hacker with full freedom to act as you wish on a vast network of procedurally generated computers.

Why similar: Massively Multiplayer 66.3%, Simulation 20.4%, Sandbox 7.9%, Indie 5.4%

In Metaverse you will dig, discover, design, deploy, and defend. Explore, build upon, or tear apart your own procedurally generated voxel planet. And now in the early stages of our multiplayer implementation, help conquer or build the planets of others.

Why similar: RPG 28.5%, Simulation 26.1%, Sandbox 20.4%, Action 14.8%, Indie 10.1%

Starbase is a hybrid voxel/vertex-based space MMO with a fully destructible and infinitely expanding universe, with a focus on building and designing spaceships and stations, exploration, resource gathering, crafting, trading, and combat.

Why similar: Massively Multiplayer 51.8%, Open World 14.8%, Sandbox 12.4%, Simulation 11%, Multiplayer 5.2%

Planet Explorers is an open world sandbox adventure RPG game set on a distant planet. The game uses a new OpenCL calculated voxel system to allow players to change the terrain in any way, create new objects such as weapons, vehicles, objects, and do it anywhere.

Why similar: Sandbox 29.6%, Open World 26.4%, RPG 17.7%, Multiplayer 12.7%, Simulation 5.9%

Rise of Ages is a sandbox game, allowing you to explore, build, found cities, make wars and evolve technologies to reach the highest level of a civilization and then travel to other planets! The game begins in prehistory and will advance ages, one by one, as the player evolves.

Why similar: RPG 32.3%, Open World 24%, Sandbox 17.2%, Action 16.3%, Indie 10.2%

Life is Feudal: Arden is a new free-to-play open-world MMORPG set in the Middle Ages, built on the foundation of Life is Feudal: MMO. Engage in thrilling PvP combat, navigate political intrigue, master a variety of professions and craft unique items. Forge your own path to power and greatness!

Why similar: Massively Multiplayer 24.1%, RPG 20.9%, Sandbox 17.8%, Simulation 12.8%, Open World 10%

Play solo or in up to 10-player multiplayer co-op! Flashing Lights is an open world police, firefighting and EMS simulator game with plenty of opportunity for role-play or more relaxed fun with friends. Become the law or save lives! Discover leagues of player-created mods!

Why similar: Massively Multiplayer 39.6%, Open World 12%, RPG 11.8%, Simulation 11.7%, Sandbox 11.5%

Shape your citizen, forge your destiny and sculpt your world in this epic voxel sandbox MMO built on endless possibility.

Why similar: Massively Multiplayer 52.1%, Sandbox 14.3%, Open World 13.6%, RPG 9.1%, Action 3.7%

Everwind is a novel take on RPG and Sandbox Survival genre in First-Person-Perspective. Embark on the adventure with your friends - Build a base on a flying island-ship, gather resources, craft, loot, and fight while you rise above the clouds to uncover the mysteries of this world!

Why similar: Open World 27.8%, RPG 27.2%, Sandbox 26.5%, Multiplayer 18.5%

Rogalia is the sandbox with fantasy open world, meal-based character leveling, nice graphics and cozy atmosphere.

Why similar: Massively Multiplayer 61.1%, RPG 12.7%, Sandbox 11.6%, Open World 11.2%, Indie 3.4%

A sandbox battle simulator game where you can build your own shape-shifting warbots, program their AI, and watch them smash each other up on the battlefield! Join the battles yourself by taking control of the warbots! Use Steam Workshop to check out warbots created by players from around the world!

Why similar: Sandbox 46.6%, Simulation 38.4%, Action 14.9%

Wild Omission is an open world sandbox survival game with severe weather set in an infinite procedurally generated world. Play alone or with friends.

Why similar: Open World 30.6%, Sandbox 28.3%, Multiplayer 21.4%, Action 12.8%, Indie 7%

An eternal indie MMORPG where your CODE does the grinding. Play manually or automate up to 4 characters with JavaScript. Hunt rare loot, craft equipment, and trade with real players. No coding experience needed! September 2026 brings anniversary rewards and a few surprises.

Why similar: Massively Multiplayer 51.8%, Sandbox 18.6%, Simulation 12.9%, RPG 11.6%, Indie 5.1%

Enter a living post-apocalyptic sandbox where the world doesn't wait for you. Build, craft, trade, earn the trust of factions, and forge your own path through a brutal procedural wasteland.

Why similar: Sandbox 21.1%, Open World 20%, RPG 19.8%, Simulation 15.9%, Multiplayer 13.7%

Hurricane is a 3rd person multiplayer survival game in open fantasy world.

Why similar: Massively Multiplayer 59.8%, RPG 17%, Open World 9.4%, Action 8.3%, Indie 5.4%

Gather resources, craft components, build vehicles, and code their logic in a physics-driven engineering sandbox and full scale space sim.

Why similar: Sandbox 31%, Open World 29.1%, Simulation 22.9%, Multiplayer 17%

Total Miner is an open world voxel sandbox game. It is primarily designed for creative RPG game builders, but also has two action/adventure style game modes where you can just jump in and play.

Why similar: Sandbox 24.7%, RPG 21.1%, Open World 19.8%, Multiplayer 16.5%, Action 10.6%

A 2D sandbox survival game designed for creators, players, and everyone else.

Why similar: Simulation 38.8%, Open World 22.3%, Action 22%, Indie 16.9%

Force of Nature is a Sandbox game that combines Action, Adventure, RPG, Strategy and Management genres

Why similar: Sandbox 23.5%, Open World 23.5%, Simulation 14.9%, RPG 14.9%, Multiplayer 13.2%

Adventures await in a world brought to life by realistic graphics! Experience genuine adventures in the grand world of Rebirth Online. Battle, craft, explore, and combine different types of equipment and abilities to create your own style of play.

Why similar: Massively Multiplayer 70.4%, RPG 18.6%, Open World 8.7%, Action 2.2%

A fully moddable city sandbox with jobs, NPCs, apartments, garages, gangs, and more. Broke Protocol is an open-world action game focused on roleplaying and custom content. Define your goals and identity in a persistent, reactive world where you write your own story.

Why similar: Sandbox 24.2%, Open World 23%, RPG 20.1%, Multiplayer 15.9%, Action 10.1%

S&box is a game creation platform built on the Source 2 engine. Play, create, and share games, explore community creations, and experience endless sandbox fun with powerful modern tools.

Why similar: Sandbox 72.1%, Action 27.9%

Enter a novel digital universe with infinite possibilities. Whether you resonate with people around the world in a casual conversation, playing games and socializing or you riff off each other when creating anything from art to programming complex games, you'll find your place here.

Why similar: Sandbox 59.2%, Multiplayer 40.8%

Welcome to the Sandbox World! Here, you bring your ideas to life: create tanks, airplanes, ships, and anything else – with over 120 unique blocks at your disposal. Engage, defend, and showcase your masterpieces in tense multiplayer battles that await you!

Why similar: Sandbox 41.3%, Simulation 36.8%, Action 18.3%, Multiplayer 3.6%