Wikipedia
Dragonchess is a three-dimensional fantasy chess variant created by Gary Gygax, co-creator of the famed role-playing game Dungeons & Dragons. The game was introduced in 1985 in issue No. 100 of Dragon Magazine.
The Dragonchess gameboard consists of three vertically stacked 12×8 levels. The upper level (blue and white) represents the air, the middle level (green and amber) represents the land, and the lower level (red and brown) is the subterranean world .
The Dragonchess game pieces (42 per player) are an ensemble of characters and monsters inspired or derived from fantasy settings in Dungeons & Dragons. Intricate inter- and intra-level game piece capabilities are defined. As in chess, the game is won by delivering checkmate to the enemy king.