Posit: 3-D board game

From BoardGameGeek:

Abstract strategy game for two players, played on a 6x6 square board. Each player has a pawn. Initially, the pawns are placed on the c6 and d1 squares. In each turn, players move own pawn to adjacent square, and then place a cube in any square. The cube can stacked up to three levels. Pawn can move vertically, horizontally and diagonally. In addition, pawn can climb to the cube on one level. However, pawn can not go down the level, climb two levels at once or climb on top of the three levels of the cube. A player win if the opponent's pawn can not move.