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Slammer playtest
by CampinCarlStudios
A multiplayer FPS where the gunplay comes first. 32 weapons, 24 attachments, and bots that fight like people, no wallhacks or aim assist. Free playtest out now, four-player matches and objective modes. Battle royale in development.
Anyone with a Steam account can join, and it's free.
- Access
- Instant
- On playtest since
- Apr 17, 2026
- Planned release
- Coming soon
- Developer
- CampinCarlStudios
- Platforms
- Windows, macOS, Linux
- Players
- Cross-platform, Multiplayer, Online PvP, PvP, Single-player
- Languages
- English
How to join the Slammer playtest
- Open the game's Steam page with the Join playtest button. Sign in to Steam if it asks.
- Use the Slammer playtest signup there. You're in straight away, with nothing to pay.
- The playtest shows up in your Steam library, ready to install and play.
New to playtests? How Steam playtests work
About Slammer
What Is Slammer?
A multiplayer FPS where the gunplay comes first. 32 weapons, 24 attachments, learnable recoil, and hit registration the server actually verifies. It's headed toward a battle royale. Right now it's a free playtest you can be in within two clicks.
What You Can Play Right Now
Four-player online matches with objective modes and bots that fight like people.
- Kill Race — race to reach a kill target. Activate it by shooting a glass box, which puts your position on blast.
- Lockdown — hold a zone against escalating waves of bots. No respawns.
- 32 weapons across 7 categories — assault rifles, SMGs, LMGs, marksman rifles, snipers, pistols, launchers
- Full gunsmith with 24 attachments that actually change how a weapon handles
- Bolt action, semi-auto, burst, and full auto with recoil patterns you can learn
- Hybrid ballistics — hitscan up close, simulated projectiles at range
- Bots that play by your rules — same inputs, same information, no aim assist and no wallhacks. Squad up or run it solo.
- Full controller support with aim assist
- Windows, Linux, and Steam Deck
Where It's Going
The battle royale is in active development. The playtest exists because the gunplay has to be right before anything else matters. Every weapon and every system you're testing is the foundation the full game gets built on.
Slammer is built by one person. I work in Unreal Engine professionally by day and build this at night, and there's a new build and dev log every Friday.
Your Feedback Shapes The Game
This isn't finished, and that's the point. Download it, break it, and tell me what's wrong with it. Every piece of feedback goes straight to the developer, because the developer is one guy and he's reading all of it.
From the game's Steam page.
