Life & fun · alternatives · 2026

24 alternatives to Polygon Longform - Atlas Reactor

How an MMO studio created a great competitive game

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Polygon Longform - Atlas Reactor launched in 2015; newer entries below may have overtaken it.

1. 1AO
   An online 2D MMO game, written in Rust and JavaScript▲171

   I made a game (https://polyfight.io/) which revolves around a player (a tank) leveling up and upgrading by killing shapes and other tanks (partially inspired by https://diep.io). It has a bunch of features, a vast number of tanks, an inbuilt chatting system, clans to make teams with your friends, a colour scheme maker, controllable sandboxes which can be public or private, a last man standing gamemode, and an inbuilt 1v1 system with its own ELO rankings and a global leaderboard. The game has a few players right now, and I'd hope to spread the joy players have with…

   2024 · polyfight.io · its alternatives →

2. 2
   Oort Online▲65

   A voxel MMORPG sandbox

   2015 · store.steampowered.com · its alternatives →

3. 3
   Gridland ▲87

   An adictive roleplaying stacking puzzle

   2015 · gridland.doublespeakgames.com · its alternatives →

4. 4
   Rising World▲73

   A voxel based open-world sandbox game

   2015 · rising-world.net · its alternatives →

5. 5
   Axis▲65

   A multiplayer math game

   2014 · axisthegame.com · its alternatives →

6. 6
   Outwitters▲57

   Asynchronous hex based strategy goodness

   2015 · onemanleft.com · its alternatives →

7. 7
   Dawn of Steel▲62

   Mechanized RTS warfare and a race for dominance!

   2015 · apps.apple.com · its alternatives →

8. 8
   SimpleRockets▲54

   A sandbox space experience 🚀

   2015 · store.steampowered.com · its alternatives →

9. 9
   Wings.io▲73

   Another fast paced multiplayer game

   2016 · wings.io · its alternatives →

10. 10
    Jupiter Hell▲54

    A modern turn-based sci-fi roguelike

    2016 · kickstarter.com · its alternatives →

11. 11
    Project V▲64

    A browser based scrolling shooter.

    2015 · projectv.bigvikinggames.com · its alternatives →

12. 12
    Pixel Heroes: Byte & Magic▲76

    An RPG with random generated elements.

    2015 · play.google.com · its alternatives →

13. 13
    Planetarium▲61

    An 8-bit planet generator

    2015 · managore.itch.io · its alternatives →

14. 14
    Expeditions: Viking▲69

    Historical turn-based tactical RPG

    2017 · store.steampowered.com · its alternatives →

15. 15
    Universe Sandbox ²▲68

    Create & destroy on an unimaginable scale

    2015 · universesandbox.com · its alternatives →

16. 16OS
    Open sourcing backend of our turn-based multiplayer gaming platform▲9

    2015 · bitbucket.org · its alternatives →

17. 17
    SpatialOS - Public Beta▲12

    A platform for building games of ‘unprecedented size’

    2017 · its alternatives →

18. 18OS
    Open-source MMORPG prototype inspired by World of Warcraft▲6

    2025 · everwilds.io · its alternatives →

19. 19EI
    Erth.io – a multiplayer platform brawler▲9

    2017 · erth.io · its alternatives →

20. 20TG
    The Grid engine, a beautifully designed 2D game engine▲7

    2015 · andrewmcwatters.com · its alternatives →

21. 21
    Swarmation▲6

    The Multiplayer Pixel Formation Game

    2017 · swarmation.com · its alternatives →

22. 22
    GameLisp, a scripting language for Rust game development▲5

    2020 · gamelisp.rs · its alternatives →

23. 23
    My Peer-to-Peer Multiplayer JavaScript Game Framework▲9

    2015 · github.com · its alternatives →

24. 24
    DevFlip: Marketplace for Video Game Developers▲6

    2018 · devflip.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →