Nextbots: Backrooms Sandbox is a free online shooting game that drops you onto a space military base carved into an asteroid, where surviving means grabbing every weapon you can find and holding off waves of relentless monsters. The core mechanic is simple but chaotic — guns are scattered across the meteor surface, so you need to move fast, arm yourself, and start shooting before the nextbots close in.

What makes this sandbox shooter stand out is the portal gun mechanic. You control how intense things get by summoning enemies yourself, which means you can crank up the chaos or pace yourself while farming points. The space setting gives every firefight a fresh backdrop compared to standard backrooms games, and the leaderboard system keeps things competitive whether you're grinding solo or going head-to-head with friends to see who racks up the highest score.

This game is a solid pick for fans of 1-player shooter games, backrooms-style survival challenges, and anyone who enjoys sandbox war games with a sci-fi twist. If you've been searching for free nextbots games online, monster shooting games with no download, or space sandbox shooters playable on Android and browser, this one checks every box. Jump in, build your loadout from whatever you find on the ground, and see how long you can last against the horde.