The game has two basic states – the computer’s turn and the player’s turn. When it’s the computer’s turn, the cube goes a purple-ish colour and a number of sides will automatically “activate” depending on what level you’re up to.
When the cube returns to normal colour, it’s your turn! Rotate the cube by click-dragging, then single-click the same sides that lit up during the computer’s turn, in the order they lit up. Do this successfully and you’ll level up – failing will reset you to zero.
Each side has a unique tone that plays when it activates. You won’t be able to see all 6 sides at once when it’s the computer’s turn, so you’ll have to try to memorise where tones are in relation to each other. See how far you can get!