Particula

Particula is a three-player co-op tower defense game where you and two friends defend against waves of incoming threats. The game emphasizes repeated attempts and learning from failure—expect to lose runs and retry with adjusted strategies. Its visual style leans abstract, framing the defense mechanics around clearing obstacles and maintaining focus. Rounds require coordination between all three players, so solo play isn't an option. The developers position it as a concentration exercise wrapped in a game format, though mechanically it's still about placing defenses and surviving escalating waves. If you've got a regular trio and like tower defense that demands communication, it's built for that exact setup.