Choose Alien Swarm: Reactive Drop
Choose Alien Swarm: Reactive Drop if you want the Includes Source SDK, Steam Leaderboards, and Online PvP side of the pairing. 6,652 Steam reviews back the pick.
Alien Swarm: Reactive Drop vs Mauled Horde
Alien Swarm: Reactive Drop and Mauled Horde both land in Action, Free To Play 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, Free To Play on Steam. Alien Swarm: Reactive Drop (2017) is 9 years older than Mauled Horde (2026). Both are free to play. 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 Mauled Horde
Choose Mauled Horde if you want an Indie and Early Access experience. On Steam, it's the newer release (2026) and ships with the modern feature baseline. Mauled Horde launched in 2026.
Both Alien Swarm: Reactive Drop and Mauled Horde sit in Action and Free To Play on Steam and both list Multi-player, Online Co-op, and LAN 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
 Alien Swarm: Reactive Drop |  Mauled Horde | |
|---|---|---|
| Released | 2017 | 2026 |
| Genres | Action, Free To Play | Action, Indie, Free To Play, Early Access |
| Platforms | Windows | Windows |
| Steam Deck | Deck Unsupported | Unrated |
| Price | Free to play | Free to play |
| Steam reviews | 94.1% positive (6,652 reviews) | — |
| Multiplayer | Multi-player, Online Co-op, LAN Co-op | Multi-player, Online Co-op, LAN Co-op |
| Developers | Reactive Drop Team | Elements Games |
Side by side
- Both share Action, Free To Play on Steam.
- Alien Swarm: Reactive Drop (2017) is 9 years older than Mauled Horde (2026).
- Both are free to play.
- Both support cooperative play.
- Alien Swarm: Reactive Drop is Deck Unsupported on Steam Deck; Mauled Horde has no Deck rating yet.
Alien Swarm: Reactive Drop vs Mauled Horde — FAQ
- Should I play Alien Swarm: Reactive Drop or Mauled Horde first?
- If you want chronology, Alien Swarm: Reactive Drop (2017) came out before Mauled Horde (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 Alien Swarm: Reactive Drop and Mauled Horde similar?
- They overlap on Action, Free To Play 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 Alien Swarm: Reactive Drop and Mauled Horde have co-op?
- Yes — both list a co-op category on Steam. Specifics differ: Alien Swarm: Reactive Drop ships Online Co-op, LAN Co-op; Mauled Horde ships Online Co-op, LAN Co-op.