6 tower defense games on Steam with co-op or multiplayer, ranked by how many people are playing right now and how well they review. Part of Strategy.
Which of these do we both own? →
| Game | Modes | Type | Rating | Playing now | Price |
|---|---|---|---|---|---|
| Bloons TD 6 | Co-op, Single-player too | Tower defense | 97% | 7,489 | $13.99 |
| Dome Keeper | Co-op, PvP | Tower defense | 92% | 402 | $5.39 |
| Dungeon Defenders | Co-op, Local / split-screen | Tower defense | 93% | 284 | $14.99 |
| Orcs Must Die! 2 | Co-op, Single-player too | Tower defense | 93% | 34 | $14.99 |
| X-Morph: Defense | Co-op, Local / split-screen | Tower defense | 92% | 13 | $19.99 |
| Aegis Defenders | Co-op, Local / split-screen | Tower defense | 79% | 4 | $19.99 |
Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; updated 2026-09-08. Powered by Steam — not affiliated with or endorsed by Valve Corporation.