Choose Thief Simulator 3
Choose Thief Simulator 3 if you want the Multi-player, Online Co-op, and Custom Volume Controls side of the pairing. On Steam, it has co-op, so you can bring a friend.
Thief Simulator 3 vs 687 Days on Mars
Thief Simulator 3 and 687 Days on Mars both land in Action, Indie, Adventure on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both share Action, Indie, Adventure on Steam. Thief Simulator 3 has co-op; 687 Days on Mars does not. No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.
Which should you pick?
Choose 687 Days on Mars
Choose 687 Days on Mars if you want a Casual experience. On Steam, it's a focused single-player run rather than a multiplayer commitment. 687 Days on Mars launched in 2026.
Both Thief Simulator 3 and 687 Days on Mars sit in Action, Indie, and Adventure on Steam and both list DualShock Controller Support, so either pick lands in the same broad neighborhood. Use the side-by-side table for the feature view, or follow the "Games like" links below to see ranked alternatives for either title.
Side-by-side comparison
 Thief Simulator 3 |  687 Days on Mars | |
|---|---|---|
| Released | — | 2026 |
| Genres | Action, Indie, Adventure, Simulation | Action, Indie, Adventure, Simulation, Casual |
| Platforms | Windows | Windows |
| Steam Deck | Unrated | Unrated |
| Price | Price unknown | Price unknown |
| Steam reviews | — | — |
| Multiplayer | Multi-player, Online Co-op, Co-op | Single-player only |
| Developers | Noble Muffins | Games Incubator, Frozen Cave Studio |
Side by side
- Both share Action, Indie, Adventure on Steam.
- Thief Simulator 3 has co-op; 687 Days on Mars does not.
Thief Simulator 3 vs 687 Days on Mars — FAQ
- Are Thief Simulator 3 and 687 Days on Mars similar?
- They overlap on Action, Indie, Adventure on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.
- Does 687 Days on Mars have multiplayer like Thief Simulator 3?
- No. Thief Simulator 3 supports multiplayer on Steam (Multi-player, Online Co-op, Co-op), while 687 Days on Mars is listed as single-player only.