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Games Like VOI

60+ similar titles based on shared tags and player behavior. Themes include Casual, Puzzle, Indie, Minimalist.

VOI header art

Do you think 1 + 1 = 0 is correct? So what do you think about "black + black = white" statement?

Reviews: Very Positive — 94% — of 831 reviews
Released: 2016-11-07
Developer: Yunus Ayyildiz
Genres: Casual, Indie, Simulation
Platforms: Windows, Mac
Median playtime: 3.0 hrs
Mean playtime: 4.6 hrs
Players ≥ 1 hr: 85%

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View all 60 recommendations
  1. #1 hocus
    97% matchVery Positive91% of 790 reviews2015
    Dev: Yunus Ayyildiz
    Windows · Mac
    Median: 3.5 hrsMean: 5.1 hrs≥1hr: 90%

    perspective illusion puzzle based on M.C. Escher drawings and impossible shapes

    Why similar: Puzzle 23%, Indie 19%, Casual 16.7%, Minimalist 14.2%, Difficult 12.6%

  2. #2 Wayout
    96% matchVery Positive88% of 1,173 reviews2016
    Dev: KonstructorsPub: Hook Games
    Windows · Mac · Linux
    Median: 2.8 hrsMean: 7.5 hrs≥1hr: 78%

    Relax, clear your mind and find the way out.

    Why similar: Puzzle 27%, Difficult 18.9%, Minimalist 14.7%, Casual 14.4%, Indie 11.8%

  3. #3 klocki
    96% matchOverwhelmingly Positive97% of 4,670 reviews2016
    Dev: Maciej Targoni
    Windows · Mac · Linux
    Median: 2.1 hrsMean: 3.1 hrs≥1hr: 78%

    Minimal puzzle game.

    Why similar: Puzzle 22.8%, Logic 19.4%, Minimalist 18.5%, Relaxing 16.1%, Casual 10.8%

  4. #4 LineWay
    95% matchVery Positive93% of 558 reviews2017
    Dev: PONY
    Windows · Mac
    Median: 1.8 hrsMean: 3.6 hrs≥1hr: 69%

    Can you draw a line?

    Why similar: Puzzle 30.4%, Casual 26.4%, Minimalist 18.1%, Relaxing 12.3%, Indie 9.8%

  5. #5 macdows 95
    94% matchVery Positive92% of 619 reviews2019
    Dev: Yunus Ayyildiz
    Windows
    Median: 3.1 hrsMean: 4.4 hrs≥1hr: 90%

    you have an update for your operating system...

    Why similar: Puzzle 20.5%, Casual 18.7%, Indie 14.7%, Difficult 12.7%, Logic 11%

  6. #6 CIPHER ZERO
    93% matchVery Positive93% of 156 reviews2025
    Dev: Zapdot
    Windows · Mac · Linux

    A minimalist logic game. Can you solve for 𝒙?

    Why similar: Logic 20.2%, Puzzle 19%, Difficult 17.2%, Minimalist 17.1%, Relaxing 12.1%

  7. #7 PUSH
    94% matchVery Positive87% of 693 reviews2017
    Dev: Maciej TargoniPub: Hamster On Coke Games
    Windows · Mac · Linux
    Median: 1.2 hrsMean: 2.4 hrs≥1hr: 62%

    Can you push all the buttons?

    Why similar: Puzzle 31.2%, Casual 25.1%, Minimalist 19.8%, Indie 12.9%, Relaxing 11%

  8. #8 Delete
    92% matchOverwhelmingly Positive96% of 1,648 reviews2018
    Dev: PONY
    Windows · Mac
    Median: 2.7 hrsMean: 63.2 hrs≥1hr: 79%

    Let the number tell you what to do

    Why similar: Puzzle 29.5%, Casual 21.8%, Minimalist 18.7%, Indie 14.3%, Relaxing 12.3%

  9. #9 Puzzlement
    91% matchVery Positive92% of 235 reviews2018
    Dev: Yunus Ayyildiz
    Windows · Mac
    Median: 54 minMean: 1.8 hrs≥1hr: 47%

    a game about walking/jumping between plane surfaces to collect all red squares

    Why similar: Puzzle 15.8%, Simulation 13.7%, Minimalist 13.1%, Logic 10.8%, Casual 10.3%

  10. #10 Paint It Black
    91% matchVery Positive80% of 66 reviews2018
    Dev: Decabry
    Windows · Mac · Linux
    Median: 1.4 hrsMean: 2.5 hrs≥1hr: 57%

    2D puzzle-action game in black and white

    Why similar: Casual 21%, Puzzle 17.9%, Minimalist 16.1%, Indie 15.7%, Physics 13%

  11. #11 SquareCells
    90% matchVery Positive90% of 1,236 reviews2015
    Dev: Matthew Brown
    Windows · Mac · Linux
    Median: 4.0 hrsMean: 5.3 hrs≥1hr: 74%

    SquareCells is an ambient logic puzzle game.

    Why similar: Puzzle 42%, Minimalist 17.3%, Casual 15.2%, Indie 13.5%, Logic 11.9%

  12. #12 Hook
    89% matchOverwhelmingly Positive97% of 8,911 reviews2015
    Dev: Maciej Targoni
    Windows · Mac · Linux
    Median: 2.7 hrsMean: 4.0 hrs≥1hr: 83%

    HOOK is a short minimal, puzzle game.

    Why similar: Puzzle 27.5%, Relaxing 19.2%, Minimalist 16.6%, Casual 15.3%, Logic 8.5%

  13. #13 OVIVO
    89% matchVery Positive90% of 467 reviews2017
    Dev: IzHard
    Windows · Mac · Linux
    Median: 3.1 hrsMean: 12.1 hrs≥1hr: 84%

    OVIVO is a minimalistic platformer with unusual mechanics where everything is as simple as black and white. The journey in this metaphoric world is filled with illusions and hidden messages.

    Why similar: Difficult 22.9%, Minimalist 21.4%, Physics 18.8%, Puzzle 13.1%, Casual 9.6%

  14. #14 Hexcells Plus
    88% matchVery Positive95% of 2,789 reviews2014
    Dev: Matthew Brown
    Windows · Mac · Linux
    Median: 6.4 hrsMean: 10.7 hrs≥1hr: 81%

    Hexcells Plus is an ambient logic puzzle game for PC, Mac and Linux.

    Why similar: Puzzle 43.2%, Logic 12.8%, Casual 11.2%, Minimalist 10.3%, Indie 9.1%

  15. #15 Oik
    87% matchVery Positive90% of 1,726 reviews2017
    Dev: Crew Lab
    Windows
    Median: 2.9 hrsMean: 6.4 hrs≥1hr: 84%

    Casual physics puzzle

    Why similar: Puzzle 19.7%, Minimalist 18.2%, Physics 17%, Relaxing 14.8%, Casual 13.1%

  16. #16 Oik 3
    86% matchVery Positive87% of 1,023 reviews2017
    Dev: Crew Lab
    Windows
    Median: 3.9 hrsMean: 8.9 hrs≥1hr: 87%

    Casual physics puzzle.

    Why similar: Puzzle 20.8%, Minimalist 19.1%, Physics 17.6%, Casual 9.8%, Logic 7.5%

  17. #17 hocus 2
    86% matchVery Positive86% of 70 reviews2021
    Dev: Yunus Ayyildiz
    Windows · Mac

    ■■■■■■■..........º.......º......º.......

    Why similar: Puzzle 23.8%, Casual 20.9%, Logic 19.7%, Minimalist 19%, Relaxing 9.2%

  18. #18 CrossCells
    85% matchVery Positive83% of 887 reviews2017
    Dev: Matthew Brown
    Windows · Mac · Linux
    Median: 1.9 hrsMean: 3.0 hrs≥1hr: 63%

    CrossCells is an ambient logic puzzle game.

    Why similar: Puzzle 36.3%, Casual 20.6%, Minimalist 15.2%, Indie 14.5%, Logic 13.4%

  19. #19 Unium
    84% matchVery Positive93% of 319 reviews2015
    Dev: Kittehface Software
    Windows · Mac · Linux
    Median: 3.3 hrsMean: 3.9 hrs≥1hr: 83%

    Draw a line. A single line. How complex can that be?

    Why similar: Puzzle 41.9%, Casual 26.4%, Indie 16.7%, Minimalist 15%

  20. #20 Oik 2
    83% matchVery Positive93% of 1,374 reviews2017
    Dev: Crew Lab
    Windows
    Median: 2.8 hrsMean: 22.4 hrs≥1hr: 87%

    Casual physics puzzle

    Why similar: Minimalist 24.3%, Physics 21.8%, Puzzle 13.2%, Casual 13%, Relaxing 10.3%

  21. #21 Pure Logic
    81% matchVery Positive93% of 91 reviews2023
    Dev: Sigmund Hoien
    Windows

    Explore logic symbols. Discover the rules. Solve complex puzzles. Feel the power of your logical side!

    Why similar: Logic 23.4%, Puzzle 19.8%, Difficult 19.8%, Minimalist 14.4%, Casual 7.7%

  22. #22 Ripple
    84% matchMixed67% of 72 reviews2017
    Dev: Playrock Studios
    Windows
    Median: 3.4 hrsMean: 4.3 hrs≥1hr: 97%

    Minimalistic logic puzzle game that's easy to understand, yet hard to master! Are you new to puzzle games, a seasoned veteran or an achievement hunter / trader? Solve some Ripples!

    Why similar: Puzzle 26%, Logic 24%, Minimalist 23.1%, Casual 9.6%, Indie 9.1%

  23. #23 Unitied
    82% matchVery Positive98% of 53 reviews2019
    Dev: Peter Hijma
    Windows · Mac · Linux

    Unitied is a minimalistic & relaxing puzzle game

    Why similar: Casual 20.7%, Puzzle 18.8%, Minimalist 15%, Indie 14.6%, Difficult 14.1%

  24. #24 Linked
    81% matchVery Positive91% of 583 reviews2017
    Dev: ThinkOfGamesPub: Conglomerate 5
    Windows
    Median: 3.0 hrsMean: 18.9 hrs≥1hr: 83%

    Relaxing, minimalistic 2d-puzzle game.

    Why similar: Puzzle 24.1%, Casual 16.1%, Indie 15.7%, Relaxing 13.6%, Minimalist 12.2%

  25. #25 Alveole
    80% matchVery Positive81% of 69 reviews2021
    Dev: Emil IsmaylovPub: North Lab
    Windows · Mac

    Alveole is a minimalistic puzzle where the player must understand how to run and why does he do it?

    Why similar: Minimalist 29.3%, Puzzle 27.7%, Casual 16.5%, Logic 13.6%, 2D 6.6%

  26. #26 akda
    82% matchMostly Negative29% of 87 reviews2017
    Dev: Snkl Studio
    Windows
    Median: 36 minMean: 87.8 hrs≥1hr: 41%

    A simple physical puzzle.

    Why similar: Puzzle 19.7%, Difficult 19.5%, Minimalist 16.1%, Physics 14.5%, Logic 8%

  27. #27 ReThink
    79% matchVery Positive82% of 289 reviews2017
    Dev: Yaeko
    Windows
    Median: 1.5 hrsMean: 3.4 hrs≥1hr: 56%

    As an inmate of a government-controlled Correctional Facility in the year 2275, you have the right to prove yourself worthy of being part of Society again. Show your skills in logical thinking by solving puzzles of varying size, type and difficulty in this first-Person puzzle game, and redeem your freedom!

    Why similar: Logic 21.9%, Puzzle 21.3%, Minimalist 16.1%, Difficult 12.9%, Relaxing 11.4%

  28. #28 Evo Explores
    78% matchVery Positive94% of 349 reviews2016
    Dev: Kyrylo Kuzyk
    Windows · Mac · Linux
    Median: 1.8 hrsMean: 2.5 hrs≥1hr: 68%

    Explore impossible geometry and optical illusions!

    Why similar: Puzzle 42.5%, Casual 33.8%, Indie 23.7%

  29. #29 Zup! XS
    77% matchVery Positive85% of 1,437 reviews2019
    Dev: Quiet River
    Windows
    Median: 3.0 hrsMean: 14.8 hrs≥1hr: 85%

    Experimental minimal physical puzzle with explosions.

    Why similar: Puzzle 21.1%, Casual 20.1%, Physics 14%, Minimalist 13.4%, Indie 12.3%

  30. #30 PEG
    77% matchVery Positive92% of 242 reviews2017
    Dev: Arzola's
    Windows · Mac · Linux
    Median: 3.0 hrsMean: 4.8 hrs≥1hr: 85%

    Blue eats blue. Red eats red. Until one of each remains. A puzzler that is deceptively simple but hard to master.

    Why similar: Puzzle 25.1%, Casual 22.6%, Minimalist 18.8%, Indie 16.4%, Relaxing 12.1%

  31. #31 Zerko
    73% matchVery Positive95% of 156 reviews2024
    Dev: Maciej Targoni
    Windows · Mac · Linux

    A puzzle game filled with shapes, numbers, and a straightforward goal: make every number zero.

    Why similar: Puzzle 26.5%, Casual 18%, Minimalist 16.9%, Logic 16.2%, Indie 7.4%

  32. #32 Rubek
    78% matchMostly Positive78% of 131 reviews2016
    Dev: Xigma Games
    Windows · Mac
    Median: 3.2 hrsMean: 3.5 hrs≥1hr: 71%

    Roll and match colors in this mind bending puzzle.

    Why similar: Casual 22.8%, Puzzle 19.6%, Minimalist 15.6%, Indie 15.1%, Difficult 14.6%

  33. #33 Gravity Block
    76% matchVery Positive93% of 56 reviews2021
    Dev: Atthus Games
    Windows

    Gravity Block is a minimalist game. Rotate screen so that the block reaches portal.

    Why similar: Puzzle 19%, Casual 16.1%, Minimalist 15.1%, Logic 12.7%, Physics 11.2%

  34. #34 Shoot. Push. Repeat.
    76% matchVery Positive85% of 72 reviews2020
    Dev: CrewLab
    Windows

    A dynamic clicker puzzle simulating real physics.

    Why similar: Casual 26.7%, Indie 18.7%, Puzzle 17.6%, Minimalist 17.1%, Relaxing 11.4%

  35. #35 Odd||Even
    79% matchMixed53% of 113 reviews2016
    Dev: kylix studio
    Windows
    Median: 4.1 hrsMean: 4.5 hrs≥1hr: 97%

    Odd||Even is a math and logic based, integer placement puzzle game.

    Why similar: Difficult 19.4%, Logic 18.9%, Puzzle 17.5%, Minimalist 15.7%, Relaxing 10.5%

  36. #36 Black Hole Simulator
    75% matchVery Positive82% of 153 reviews2021
    Dev: PanGuoJun
    Windows

    A simple black hole simulator.

    Why similar: Simulation 25.3%, Minimalist 23.6%, Casual 17.1%, Relaxing 15.4%, Physics 14.1%

  37. #37 Wayout 2: Hex
    75% matchVery Positive86% of 430 reviews2017
    Dev: KonstructorsPub: Hook Games
    Windows · Mac · Linux
    Median: 3.0 hrsMean: 4.3 hrs≥1hr: 79%

    Can you find it again?

    Why similar: Puzzle 39.5%, Casual 36.2%, Indie 24.3%

  38. #38 Art Of Gravity
    74% matchVery Positive91% of 682 reviews2017
    Dev: Hamster On Coke Games
    Windows · Mac · Linux
    Median: 2.8 hrsMean: 3.2 hrs≥1hr: 83%

    Art Of Gravity is a voxel/physics based puzzle game, revolving around the theme of destroying abstract figures, which results in mesmerizing displays of dance of gravity.

    Why similar: Puzzle 27.5%, Casual 20.9%, Physics 18.3%, Indie 16.9%, Minimalist 16.4%

  39. #39 Laser Attraction
    74% matchVery Positive90% of 60 reviews2021
    Dev: Vectmatica
    Windows

    Play with lasers and solve puzzles in Laser Attraction. Use reflection, refraction, dispersion and filtration to direct the laser beams, mix and separate colours, open doors, hit targets and complete puzzles.

    Why similar: Puzzle 16.4%, Physics 13.9%, Difficult 13.6%, Simulation 12.4%, Minimalist 9.8%

  40. #40 Zup!
    72% matchVery Positive94% of 8,882 reviews2016
    Dev: Quiet River
    Windows
    Median: 2.3 hrsMean: 14.3 hrs≥1hr: 71%

    Minimal physical puzzle with explosions

    Why similar: Puzzle 31.9%, Physics 15.9%, Minimalist 13.5%, Casual 12.9%, Relaxing 10.5%

  41. #41 Pineapple on pizza
    68% matchOverwhelmingly Positive98% of 25,576 reviews2023
    Dev: Majorariatto
    Windows · Mac · Linux

    Can a video game convey a flavor?

    Why similar: Casual 72.5%, Singleplayer 27.5%

  42. #42 3D Math - Ultra
    73% matchVery Positive94% of 221 reviews2020
    Dev: Big Mind Games 9000
    Windows · Mac · Linux

    Mathematic Ultra - is both simple and complex challenges!

    Why similar: Logic 22.1%, Puzzle 19.3%, Difficult 18.6%, Simulation 17%, Casual 11.6%

  43. #43 Nonogram - The Greatest Painter
    73% matchVery Positive90% of 375 reviews2018
    Dev: KonstructorsPub: Hook Games
    Windows
    Median: 8.0 hrsMean: 14.9 hrs≥1hr: 75%

    Do you deserve to be called The Greatest?

    Why similar: Puzzle 28.2%, Casual 22.6%, Minimalist 18.9%, Indie 15.5%, Relaxing 12.2%

  44. #44 Thought Experiment Simulator
    69% matchVery Positive82% of 703 reviews2024
    Dev: HoHo Game StudioPub: Gamera Games
    Windows · Mac
    Median: 1.0 hrsMean: 1.6 hrs≥1hr: 50%

    This is a stupid game that might include Trolley Problem, Ship of Theseus, Brain in a Vat, Infinite Monkey, Sisyphus, Prisoner's Dilemma, Schrodinger's Cat, etc.

    Why similar: Simulation 41.5%, Casual 25.4%, Indie 21.2%, 2D 8.5%, Singleplayer 3.4%

  45. #45 One Line
    71% matchVery Positive97% of 69 reviews2021
    Dev: Climbing Goat Games
    Windows

    One Line is a minimalist puzzle game where the objective is to draw a single line filling the entire board. Different mechanics will challenge your mind in this game that is easy to learn but hard to solve. Can you find the correct path?

    Why similar: Logic 24.4%, Puzzle 23.3%, Minimalist 21%, Difficult 10.8%, Relaxing 9.1%

  46. #46 INVERT
    71% matchVery Positive97% of 65 reviews2021
    Dev: Naoka Games
    Windows

    In INVERT the player will be challenged to solve several logic challenges. You must move in a limited way and make all bases turn white or all bases turn black. When jumping over a base, the same color changes and you'll use this to your advantage.

    Why similar: Puzzle 34.5%, Casual 24.4%, Minimalist 22.6%, Logic 11%, Relaxing 4.6%

  47. #47 Zup! Zero 2
    71% matchVery Positive95% of 1,292 reviews2018
    Dev: Quiet River
    Windows
    Median: 2.6 hrsMean: 7.2 hrs≥1hr: 83%

    Minimal physical puzzle with explosions

    Why similar: Puzzle 27%, Casual 14%, Physics 12.8%, Minimalist 12.2%, Indie 9.7%

  48. #48 Zup! 6
    70% matchVery Positive94% of 2,552 reviews2017
    Dev: Quiet River
    Windows
    Median: 2.7 hrsMean: 8.0 hrs≥1hr: 84%

    Minimal physical puzzle with explosions

    Why similar: Puzzle 29.6%, Casual 15.5%, Physics 11.2%, Indie 11%, Minimalist 10.5%

  49. #49 That Level Again
    67% matchVery Positive98% of 101 reviews2024
    Dev: IamTagir
    Windows

    A small logic game where all levels are the same but ways to win are not

    Why similar: Puzzle 50.2%, Casual 24.2%, 2D 11.9%, Indie 9%, Singleplayer 4.7%

  50. #50 Zup! 5
    70% matchVery Positive94% of 2,977 reviews2017
    Dev: Quiet River
    Windows
    Median: 2.2 hrsMean: 9.5 hrs≥1hr: 78%

    Minimal physical puzzle with explosions

    Why similar: Puzzle 24.2%, Physics 13.6%, Casual 12.6%, Minimalist 12.5%, Relaxing 9.8%

  51. #51 [the Sequence]
    72% matchVery Positive90% of 179 reviews2016
    Dev: [OneManBand]
    Windows
    Median: 7.1 hrsMean: 7.8 hrs≥1hr: 97%

    [the Sequence] is a logic construction puzzler.Let your mind be your guide: Lay down seven different kinds of modules as your roadblocks to get you (portrayed as a binary data point) to a sweet destination.Apply an out-of-the-box thinking to get you to the next level!

    Why similar: Logic 21.7%, Puzzle 21.1%, Minimalist 18.2%, Difficult 17%, Casual 9.5%

  52. #52 1+1=?
    67% matchVery Positive90% of 59 reviews2025
    Dev: Easy S Studio
    Windows

    Let's do some easy math with the girls!

    Why similar: Casual 50.5%, Relaxing 17.9%, 2D 17.4%, Indie 11.3%, Singleplayer 2.9%

  53. #53 Logic Town
    66% matchVery Positive92% of 304 reviews2023
    Dev: Mark FfrenchPub: Divide The Plunder
    Windows · Mac
    Median: 11.0 hrsMean: 15.0 hrs≥1hr: 85%

    Does Jim like chocolate cake? WAS JANET WEARING A HAT!?! Solve exhilarating mysteries like these in Logic Town, a relaxing coffee-break puzzle game of pure deduction.

    Why similar: Logic 24.8%, Puzzle 23.6%, Difficult 22.1%, Relaxing 13.2%, Indie 6.2%

  54. #54 Hexcells Infinite
    69% matchOverwhelmingly Positive97% of 4,629 reviews2014
    Dev: Matthew Brown
    Windows · Mac · Linux
    Median: 6.8 hrsMean: 36.0 hrs≥1hr: 78%

    Hexcells Infinite is an ambient logic puzzle game for PC, Mac and Linux.

    Why similar: Puzzle 36.7%, Logic 17.4%, Minimalist 12.8%, Casual 10.4%, Relaxing 8.7%

  55. #55 Induction
    70% matchVery Positive90% of 187 reviews2017
    Dev: Bryan Gale
    Windows · Mac · Linux
    Median: 42 minMean: 6.1 hrs≥1hr: 43%

    Induction is an abstract puzzle game about time travel and paradoxes. As you master its logic, Induction will rewire how you think about cause and effect.

    Why similar: Puzzle 64.7%, Indie 35.3%

  56. #56 .projekt
    69% matchVery Positive92% of 152 reviews2018
    Dev: Kyrylo Kuzyk
    Windows · Mac
    Median: 2.9 hrsMean: 4.3 hrs≥1hr: 68%

    Minimalistic puzzler about silhouettes from creator of Evo Explores

    Why similar: Puzzle 24%, Casual 20.6%, Minimalist 17.1%, Logic 15%, Indie 13.7%

  57. #57 Oberty
    66% matchVery Positive95% of 65 reviews2024
    Dev: Dmytro Denys
    Windows · Mac

    Oberty is mind-bending puzzle about combining shapes.

    Why similar: Puzzle 17.8%, Difficult 17.4%, Logic 15.6%, Minimalist 15%, Relaxing 8%

  58. #58 The Bridge
    68% matchVery Positive87% of 4,339 reviews2013
    Dev: Ty TaylorPub: The Quantum Astrophysicists Guild
    Windows · Mac · Linux
    Median: 2.7 hrsMean: 5.6 hrs≥1hr: 87%

    The Bridge is a logic puzzle game that forces you to reevaluate your preconceptions of physics and perspective. It is Isaac Newton meets M. C. Escher. Manipulate gravity to redefine the ceiling as the floor while venturing through impossible architectures.

    Why similar: Puzzle 24%, Physics 22.6%, Logic 18.7%, Difficult 11.9%, 2D 7.8%

  59. #59 Hade
    68% matchVery Positive90% of 332 reviews2016
    Dev: KirUn
    Windows
    Median: 3.4 hrsMean: 4.7 hrs≥1hr: 94%

    Hade is a minimalist logic game with severely difficult puzzles softened by relaxing ambient music.

    Why similar: Puzzle 26.5%, Casual 18.2%, Difficult 16.6%, Minimalist 14.4%, Indie 13.5%

  60. #60 Turn on the light
    66% matchVery Positive95% of 181 reviews2020
    Dev: Thedox Games
    Windows · Linux

    Turn On The Light is a minimalist puzzle game.

    Why similar: Minimalist 22.7%, Puzzle 21.7%, Logic 18.5%, Relaxing 17.8%, Casual 8.7%

Based on tag similarity + player behavior
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