The concept is simple, the graphics are retro and the puzzles are pleasingly perplexing. Make each row a single colour of the rainbow with red at the top and violet at the bottom. When solved, the colours should match those in the sample column on the right. To make a move, tap on a block then tap on either the clockwise or anti-clockwise button. This will rotate the 8 surrounding blocks in the chosen direction. See if you can do it in the target number of moves.