You click on a squre to move it one up the stack. When you get three-or-more in a row either vertically or horizontally they start floating up to the top of the screen. (Probably how many you get in a row determines how fast/high it jumps.) You get rid of blocks by jumping them off the top of the screen. Setting up jump-combos seems to be the only way to get things WAY far down to get off the screen. Otherwise you'll mainly be doing quick jumps from mid-screen to clear off the blocks above. (Of course you have less overall response time at that point.)
It's too simple and uninteresting, really. Not a game one feels like mastering.
