Create a maze by "painting" a seed onto your map and watch it grow via cellular automation. Then try to find your way to the exit. You can make the path more complicated by putting down waypoints that the solution has to pass through.

Controls
WASD - Move and strafe.
Mouse Click+Drag - Turn view. Draw while map is opened.
Mouse Click - Drop waypoint onto map when opened.
M - Toggle Map
Q - Ascend (Fly)
E - Descend (Fall)
1 - Cycle through solution display modes.