Stuffo is a great exercise in simple rules leading to complex puzzles. The game is surprisingly long for how few mechanics it introduces! Overall the game is moderately difficult, but none of the puzzles are so complex as to be annoying - there is a specific mechanical interaction being explored that you have to figure out.Lovely graphics and audio as well! This is a nicely polished game. My only real complaint is that the environments do not change between levels, so the visual variety suffers a bit