Underrun

Underrun drops you into a compromised facility crawling with rogue security systems. Armed with a plasma pistol, you fight your way through three increasingly dangerous levels, gunning down skittering spider-bots and stationary sentry turrets while hunting down every offline CPU terminal scattered across the map. Reboot all of a level's systems to unlock the path forward — but watch your health bar, because damage adds up fast and going down means restarting the level from your last checkpoint. Health pickups are scattered around each map to keep you in the fight, and the retro CRT-terminal presentation and dark synth soundtrack give every corridor a tense, claustrophobic edge. It's a short, replayable arcade shooter built for quick sessions: three tight levels, no fluff, just clear the systems and get out.

Click anywhere to start. Move through each level and shoot every spider-bot and sentry you find, then locate and reboot all of the level's offline CPU terminals — the notice at the top tracks how many are left. Once every system in a level is rebooted, the exit opens and you move to the next level. Clear all three levels to win. If your health reaches zero you restart the current level from the beginning, so grab health pickups when you see them.

Move: Arrow keys or WASD. Aim: mouse. Shoot: hold the left mouse button. Click once at the start screen to enable audio and begin.