13 open world adventure games on Steam with co-op or multiplayer, ranked by how many people are playing right now and how well they review. Part of Open world action.
Which of these do we both own? →
| Game | Modes | Type | Rating | Playing now | Price |
|---|---|---|---|---|---|
| Red Dead Redemption 2 | Co-op, PvP | Open world adventure | 92% | 29,885 | $14.99 |
| Red Dead Online | Co-op, PvP | Open world adventure | 83% | 2,207 | $19.99 |
| Ghost of Tsushima DIRECTOR'S CUT | Co-op, PvP | Open world adventure | 94% | 2,025 | $59.99 |
| METAL GEAR SOLID V: THE PHANTOM PAIN | Online multiplayer, Single-player too | Open world adventure | 92% | 1,333 | $17.99 |
| Assassin's Creed® Unity | Co-op, Single-player too | Open world adventure | 78% | 373 | $29.99 |
| LEGO® Marvel™ Super Heroes | Online multiplayer, Local / split-screen | Open world adventure | 95% | 298 | $19.99 |
| Avatar: Frontiers of Pandora™ | Co-op, Single-player too | Open world adventure | 69% | 272 | $29.99 |
| Assassin’s Creed® Brotherhood | Online multiplayer, Single-player too | Open world adventure | 89% | 169 | $19.99 |
| Assassin's Creed® Revelations | Online multiplayer, Single-player too | Open world adventure | 85% | 104 | $19.99 |
| Amazing Frog? | Co-op, PvP | Open world adventure | 94% | 65 | $19.99 |
| Dead Rising® 2 | Co-op, Single-player too | Open world adventure | 78% | 64 | $19.99 |
| Assassin’s Creed® III | Online multiplayer, Single-player too | Open world adventure | 74% | 14 | |
| Red Faction Guerrilla Steam Edition | Online multiplayer, Single-player too | Open world adventure | 90% | 5 |
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.