XIQ is a game about trapping. Your avatar can fire in four directions, creating lines. If those lines form a box, the triangles in the box are destroyed and you score points.
Move with the arrow keys or joystick. Shoot in all four directions with W, A, S and D keys. Once a bullet is fired, it creates a trailing line. This line forms the edge of a box. Use four lines to create a box, trapping triangles inside.
Any triangle touching a line will freeze in place until that line disappears. Once the line disappears the triangle becomes quite anxious to collide with the player.
The amount of points you get for a box is dependant on the size of the box and the number of triangles inside it. Temporary powerups disappear after five seconds, but effects granted by the permanent ones stay until the end of the game.