A first-person shooter in the visual spirit of the early-90s corridor classics: ten hand-tuned levels, six kinds of enemy that hunt you through the maze, four weapons to unlock along the way, and an Overlord waiting at the end. Each level tightens the clock, thickens the horde and hands you a little more armour and ammunition to meet it with.

The corridor-shooter formula has stayed popular for three decades because it asks for very little explanation and rewards pure reflex — read the room, pick a target, keep moving. Chaining kills quickly builds a score multiplier, so playing aggressively pays off more than hiding in a corner, and supplies only come from what the dead leave behind and what you find scattered through the level.

Everything runs inside the browser tab with nothing to install and no account to make, on desktop with mouse and keyboard or on a phone with on-screen controls. Every level carries its own music, and your progress through the campaign and best score are remembered on your own device between visits.