Laser League, a unique team-based multiplayer game where players have to avoid lasers in an arena, is hosting a closed beta this weekend on PC via Steam. It will start on December 15 and go on until December 17. You can sign up for the beta here.

We checked out Laser League at this year’s Electronic Entertainment Expo in Los Angeles. We were impressed enough to give the game the Unreal E3 Award for Most Addictive.

Betas give developers a chance to test a game before launching it. This is especially important for multiplayer and competitive titles, where studios have to tune all mechanics to provide a fair experience for all players. But betas can also be a marketing tool. They work as a demo, giving people a way to try a game ahead of its launch.

Laser League will become available on Steam via Early Access sometime in early 2018.