Games where the play involves three dimensional reasoning, more complex than making stacks or climbing hills. 2D Games with a limited 3D component such as stacked boards or upright board instead of lying flat do not qualify. Simple 3d dexterity games such as Jenga, while wonderful, do not qualify.
Crabro was my first own-design stunt kite, named after a genus of black and yellow stinging insect in the UK
A blast from the past:
From the 'geek: "It is played on a map which displays 74 star sytems in a three-dimensional 'sphere' of space measuring roughly 40 light years in diameter, with our home system at the center. A grid of hexagons printed over the map is used to regulate movement and position of pieces."
When you played this game, you could see your enemies' position on the map, but had no exact idea where he was in the third dimension...