Choose Serious Sam: Siberian Mayhem
Choose Serious Sam: Siberian Mayhem if you want the Multi-player, Online Co-op, and Co-op side of the pairing. On Steam, it has co-op, so you can bring a friend. 1,520 Steam reviews back the pick.
Serious Sam: Siberian Mayhem vs NUCLIDEAN
Serious Sam: Siberian Mayhem and NUCLIDEAN both land in Action, 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, Adventure on Steam. Serious Sam: Siberian Mayhem has co-op; NUCLIDEAN does not. Serious Sam: Siberian Mayhem is Deck Playable on Steam Deck; NUCLIDEAN has no Deck rating yet. 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 NUCLIDEAN
Choose NUCLIDEAN if it's a focused single-player run rather than a multiplayer commitment.
Both Serious Sam: Siberian Mayhem and NUCLIDEAN sit in Action and Adventure on Steam, 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
 Serious Sam: Siberian Mayhem |  NUCLIDEAN | |
|---|---|---|
| Released | 2022 | — |
| Genres | Action, Adventure | Action, Adventure |
| Platforms | Windows | Windows |
| Steam Deck | Deck Playable | Unrated |
| Price | 19.99 USD | Price unknown |
| Steam reviews | 91.4% positive (1,520 reviews) | — |
| Multiplayer | Multi-player, Online Co-op, Co-op | Single-player only |
| Developers | Croteam, Timelock Studio | NDT |
Side by side
- Both share Action, Adventure on Steam.
- Serious Sam: Siberian Mayhem has co-op; NUCLIDEAN does not.
- Serious Sam: Siberian Mayhem is Deck Playable on Steam Deck; NUCLIDEAN has no Deck rating yet.
Serious Sam: Siberian Mayhem vs NUCLIDEAN — FAQ
- Are Serious Sam: Siberian Mayhem and NUCLIDEAN similar?
- They overlap on Action, 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 NUCLIDEAN have multiplayer like Serious Sam: Siberian Mayhem?
- No. Serious Sam: Siberian Mayhem supports multiplayer on Steam (Multi-player, Online Co-op, Co-op), while NUCLIDEAN is listed as single-player only.
- Does Serious Sam: Siberian Mayhem run on Steam Deck?
- Yes — Serious Sam: Siberian Mayhem is rated Deck Playable by Valve. NUCLIDEAN doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.