Small paws.
Big defence.

Your garden. Your cat patrol. An endless swarm with absolutely no respect for either.

Build a maze, recruit your defenders, and hold the line in this pixel-art tower defence game.

Available for macOS and Windows.

Free to play. No account needed.
Unsigned builds. Read the installation notes.

Make them take
the long way.

Place your cats to shape the swarm’s route. Block every path and enemies fight their way through. Pause to plan your next move.

Grow three distinct cat roles through six tower tiers. Discover permanent powerups, face bosses, and rebirth with a stronger coin bonus.

Play solo or join up to two friends. Tend your own gardens, watch each other’s patrols, and chat as you progress at your own pace.

These builds are unsigned, and the Mac app isn’t notarized. Your computer may ask for an extra confirmation before opening the game.

Installing on macOS

Unzip the download and open the macos folder.
Drag Purrimeter.app to Applications, then open it.
If macOS blocks this unnotarized app and you trust this download, open System Settings → Privacy & Security, find Purrimeter, and choose Open Anyway. On older macOS versions, look in System Preferences → Security & Privacy → General.

Installing on Windows

Right-click the ZIP and choose Extract All.
Open the extracted folder and run Purrimeter.exe. Keep Purrimeter.pck beside it.
If SmartScreen shows “Windows protected your PC” and you trust this download, choose More info → Run anyway, if offered.

Some Windows security settings or managed computers block unsigned apps entirely. See Microsoft’s explanation of SmartScreen.

Your garden saves automatically. Switch between single player and multiplayer with the same progress.