Choose Zombie Panic! Source
Choose Zombie Panic! Source if you want a Free To Play and Casual game with Includes Source SDK, Mods, and Mods (require HL2). On Steam, it carries the stronger Steam consensus at 85.9% positive across 3,795 reviews.
Zombie Panic! Source vs Contagion
Zombie Panic! Source and Contagion 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. Zombie Panic! Source (2008) is 5 years older than Contagion (2013). Zombie Panic! Source scores higher on Steam reviews (85.9% positive) than Contagion (73.2% positive). 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 Contagion
Choose Contagion if you want the Steam Leaderboards, Subtitle Options, and Custom Volume Controls side of the pairing. On Steam, it's the newer release (2013) and ships with the modern feature baseline. 5,535 Steam reviews back the pick.
Both Zombie Panic! Source and Contagion sit in Action, Indie, and Adventure on Steam and both list Multi-player, Online PvP, and Online Co-op, 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
 Zombie Panic! Source |  Contagion | |
|---|---|---|
| Released | 2008 | 2013 |
| Genres | Action, Indie, Adventure, Free To Play, Casual | Action, Indie, Adventure |
| Platforms | Windows, Linux | Windows |
| Steam Deck | Deck Playable | Deck Verified |
| Price | Free to play | 3.99 USD |
| Steam reviews | 85.9% positive (3,795 reviews) | 73.2% positive (5,535 reviews) |
| Multiplayer | Multi-player, Online Co-op, Co-op | Multi-player, Online Co-op, Co-op |
| Developers | Zombie Panic! Team | Monochrome, Inc |
Side by side
- Both share Action, Indie, Adventure on Steam.
- Zombie Panic! Source (2008) is 5 years older than Contagion (2013).
- Zombie Panic! Source scores higher on Steam reviews (85.9% positive) than Contagion (73.2% positive).
- Zombie Panic! Source is free; Contagion is paid (3.99 USD).
- Both support cooperative play.
- Steam Deck: Zombie Panic! Source is Deck Playable, Contagion is Deck Verified.
Zombie Panic! Source vs Contagion — FAQ
- Which is better, Zombie Panic! Source or Contagion?
- On Steam reviews Zombie Panic! Source scores higher (85.9% positive) than Contagion (73.2% positive). Both have enough reviews to trust the signal, so for players using reviews alone, Zombie Panic! Source is the safer pick. Genre fit still matters — check the side-by-side table for the categories each game lands in.
- Should I play Zombie Panic! Source or Contagion first?
- If you want chronology, Zombie Panic! Source (2008) came out before Contagion (2013). 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 Zombie Panic! Source and Contagion 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.
- Do both Zombie Panic! Source and Contagion have co-op?
- Yes — both list a co-op category on Steam. Specifics differ: Zombie Panic! Source ships Online Co-op, Co-op; Contagion ships Online Co-op, Co-op.
- Is Zombie Panic! Source free?
- Yes — Zombie Panic! Source is a free-to-play Steam title. Contagion is paid (3.99 USD).