The extra challenge provided by trying to match 4 (to get a potion) while not matching 3 (so the things disappear) adds an interesting extra wrinkle to this. The scene -- a potion seller, wizards -- adds some meaning to the game mechanic, and the graphics are good. Dragging is a little awkward, and unlike most match-3 games you can drag to swap any two pieces, which I didn't at first realise.