MOUSE NEEDS HOUSE
(Based on All Three-Part Variations on Three Different Kinds of Cubes.)
A mouse appears in the margins of the screen and shows you which three-cube stack he wants to live in. A bunch of cubes then fall one at a time from the top of the screen, and you must tap/click/swipe away the incorrect ones so that the correct ones fall to the ground.
One correct 3-cube stack = one point. One mistake = Game Over.