Players can move through maps, look around with the mouse, fire, jump, run, and crouch, with keyboard controls for gameplay and menus. The multiplayer options include creating a room and configuring a player name, color, map, frag limit, and maximum player count. A room-full message and return option are also part of the interface.

The game includes adjustable settings for crosshair display, dynamic lighting, sound, particles, and enemy visibility, along with options to disable damage, movement, or attacks and to invert mouse controls. Debug tools offer outlines, statistics, and an FPS panel, while recording controls support capturing visible DOM elements, enemies, pickups, the world, and special objects or items. Together, these features present cssQuake as both a playable browser port and an inspectable demonstration of rendering game environments with web technologies.