This is a combination of a sokoban and sliding block puzzle. The target cursor attempts to follow the mouse, but only the target cursor can be used to move anything else on the board. In order for the target cursor to actually move something, you must place the mouse cursor directly over the thing you want the target cursor to move. Although it may seem you have to move the mouse slow for things to keep up, (depending on the speed of your computer) I'd much rather move the mouse slow than have to hit an arrow key or mouse button for each move. My fingers hurt just thinking about it!