Wetrix was an early N64 puzzle game, where you manipulated various, almost tetris-like falling blocks onto an isometric 3D grid. The object of the game is to use these blocks to capture and enclose falling droplets of water. If too much water goes on unconstrained, you lose. There are other factors that add more strategy to the gameplay, such as slanted boards that require higher walls on one side of a "well" to contain the water, or blocks that can destroy established walls.