Choose The Chaos Gene
Choose The Chaos Gene if you want a Casual experience. The Chaos Gene launched in 2021.
The Chaos Gene vs Underground: World War
The Chaos Gene and Underground: World War both land in Action, Indie, Early Access 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, Early Access on Steam. The Chaos Gene (2021) is 5 years older than Underground: World War (2026). Underground: World War has co-op; The Chaos Gene 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 Underground: World War
Choose Underground: World War if you want the Shared/Split Screen Co-op, HDR available, and Co-op side of the pairing. On Steam, it's the newer release (2026) and ships with the modern feature baseline. Underground: World War launched in 2026.
Both The Chaos Gene and Underground: World War sit in Action, Indie, and Early Access on Steam and both list Multi-player, Shared/Split Screen, and Shared/Split Screen PvP, 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
 The Chaos Gene |  Underground: World War | |
|---|---|---|
| Released | 2021 | 2026 |
| Genres | Action, Indie, Casual, Early Access | Action, Indie, Early Access |
| Platforms | Windows | Windows |
| Steam Deck | Unrated | Unrated |
| Price | 12.99 USD | Price unknown |
| Steam reviews | 1 reviews | — |
| Multiplayer | Multi-player | Multi-player, Shared/Split Screen Co-op, Co-op |
| Developers | Andrew T Productions | Underworld Interactive |
Side by side
- Both share Action, Indie, Early Access on Steam.
- The Chaos Gene (2021) is 5 years older than Underground: World War (2026).
- Underground: World War has co-op; The Chaos Gene does not.
The Chaos Gene vs Underground: World War — FAQ
- Should I play The Chaos Gene or Underground: World War first?
- If you want chronology, The Chaos Gene (2021) came out before Underground: World War (2026). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.
- Are The Chaos Gene and Underground: World War similar?
- They overlap on Action, Indie, Early Access 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.