Free games like Colony Siege
Below are 9 free-to-play Steam games similar to Colony Siege, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Colony Siege page.
Ranked picks
- 1
Ultimate Custom Night
Free-to-play alternative to Colony Siege — no purchase or trial window.
Welcome to the ultimate FNAF mashup, featuring 50 selectable characters and custom difficulties!
- 2
Bongo Cat
Free-to-play alternative to Colony Siege — no purchase or trial window. Shares Simulation with Colony Siege.
Bongo cat needs your help. Bongo cat needz more hatz!!! Every time you press a key, Bongo cat will punch your taskbar. Type, click, play, work to collect more points. Which hats will you find?
- 3
The Lab
Free-to-play alternative to Colony Siege — no purchase or trial window.
Welcome to The Lab, a compilation of Valve’s room-scale VR experiments set in a pocket universe within Aperture Science. Fix a robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free!
- 4
The Riftbreaker: Prologue
Free-to-play alternative to Colony Siege — no purchase or trial window. Shares Strategy with Colony Siege.
The Riftbreaker: Prologue allows you to experience the events taking place before the story campaign of the main game. Explore an entirely new world. Gather resources. Build up a base. Defend yourself from thousands of alien creatures.
- 5
Jigsaw Puzzle Dreams
Free-to-play alternative to Colony Siege — no purchase or trial window.
Beautiful Multiplayer Jigsaw Puzzle game where you can design the room you play in!
- 6
Counter-Strike 2
Free-to-play alternative to Colony Siege — no purchase or trial window.
For over two decades, Counter-Strike has offered an elite competitive experience, one shaped by millions of players from across the globe. And now the next chapter in the CS story is about to begin. This is Counter-Strike 2.
- 7
Dota 2
Free-to-play alternative to Colony Siege — no purchase or trial window. Shares Strategy with Colony Siege.
Every day, millions of players worldwide enter battle as one of over a hundred Dota heroes. And no matter if it's their 10th hour of play or 1,000th, there's always something new to discover. With regular updates that ensure a constant evolution of gameplay, features, and heroes, Dota 2 has taken on a life of its own.
- 8
Tom Clancy's Rainbow Six Siege
Free-to-play alternative to Colony Siege — no purchase or trial window.
Rainbow Six® Siege is the reference in tactical team shooters, where elite strategy and execution triumph. Enjoy free access to Quick Match, Unranked, and Dual Front game modes with a selection of operators.
- 9
Empires Apart
Free-to-play alternative to Colony Siege — no purchase or trial window. Shares Strategy with Colony Siege.
An exciting free-to-play Real Time Strategy game set in medieval times. Uniquely designed factions, customization options, singleplayer and multiplayer gameplay. Gather resources, raise an army and lead your civilization to victory in a classic RTS, brought to the modern age.