Co-op games like Polygons Tower Defense
Below are 5 cooperative Steam games similar to Polygons Tower Defense, ranked by player overlap and content similarity. Every pick supports cooperative play — online co-op, LAN co-op, or shared/split-screen — so you can play with friends right out of the box. imho.run pulls from the same Steam category data Valve uses internally, so "Co-op" here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Polygons Tower Defense page.
Ranked picks
- 1
Invaders Tower Defense Online
Online Co-op alternative to Polygons Tower Defense — playable with friends. Shares Strategy and Early Access with Polygons Tower Defense.
Build your ultimate defense with a combination of powerful towers. Attack your opponent with strong Invaders. This game is sure to offer a unique and immersive experience for all tower defense enthusiasts!
- 2
Cat Go: Tactical Defense Braw
Online Co-op alternative to Polygons Tower Defense — playable with friends. Shares Action and Strategy with Polygons Tower Defense.
Cats Go! is a defense game blending strategy, cooperation, and direct combat. Grow mutant plants to protect your village! Whether you prefer to play solo as a brave defender or team up with friends online. Not feeling cooperative? Slip into the role of a devil cat and secretly sabotage the village!
- 3
Skyland Defense
Online Co-op alternative to Polygons Tower Defense — playable with friends. Shares Strategy and Early Access with Polygons Tower Defense.
Defend your skyland! Grab a tower and fight off the pirates. Build traps to slow down their march. Construct utility buildings and expand your village. Play alone or join your friends in this in-depth strategy and tower defense game!
- 4
Sky Fleet
Online Co-op alternative to Polygons Tower Defense — playable with friends. Shares Action and Strategy with Polygons Tower Defense.
Sky Fleet is an online co-op action RTS. Work together to build a base and defend it from attacking drones. Mine resources to upgrade your ship and destroy the drone's base.
- 5
Crossfire: Legion
Online Co-op alternative to Polygons Tower Defense — playable with friends. Shares Action and Strategy with Polygons Tower Defense.
Crossfire: Legion is a real time strategy game featuring tactical action in furious battles across a shattered version of the near future. Raise and customize your army to engage in intense online combat and carve your own path as you rise through the ranks. It’s a new generation of warfare.