Concept for an iOS color mixing game.
The top block represents an overlay of all blocks at the bottom. By rotating the bottom blocks, the player has to find the right turn combination of the same blocks above. A tap on a block turns it by 90 degrees clock-wise. That's the only of interaction happening during the game. As soon as the correct combination is found, the lower blocks shift together and overlay to match the top block by color mixing.
The better you understand the principle of additive color mixing (R+G+B = White), the faster you can play. The good thing: You will also learn the principle by playing LIT.