Tap Away Block Puzzle 3D

Tap Away Block Puzzle 3D popped up and I clicked it. It is a puzzle game. You look at a board or a problem and try to figure out the right solution. Some levels are obvious, others make you sit there for a few minutes. The difficulty curve feels fair. Nothing comes out of nowhere. Do not waste your power-ups on easy levels. Save them for when you are really stuck. I lost track of time playing this.