Marries van de Hoef's 7DFPS challenge entry, puzzle shooter Seven Dimensions, tasks you with exploring seven different dimensions in four field of views. The top view is a one-dimensional world (depth only) and the bottom 3 views are two-dimensional worlds (depth and width). You must shoot the green away from all dimensions and avoid shooting the red.

I played before and after going to sleep (no seven-dimensional dreams, unfortunately) and emailed the developer for a little clarification. "If there is a red target, the 1D view basically works as a natural ammo system. You can only shoot a fixed number of times (depending on the number of green targets) before you will inevitably hit the red target," he says. Sometimes, then, you have to align two or all three different world views before taking a shot.

Come train your brain in Seven Dimensions for Windows.