Hold the arena against six waves of hostile combat bots. Shoot them before they overwhelm you. Headshots do double damage, and defeated bots sometimes drop a green health cube.
On a computer: click the game to capture the mouse, then look with the mouse, move with W A S D, hold the left mouse button to fire and press R to reload.
On a phone: drag the left thumb to move, drag the right side to look around, and hold FIRE. Your aim is nudged towards enemies near your crosshair.
Use the crates and pillars as cover; bots cannot shoot through them.