Tedious chore of a game. The concept is fine and the colour based puzzles inventive (and infuriating by the end). But its biggest disadvantage is it does so little to engage the player. There's promises of a story at the beginning - a reason for it all, but it's so thin on the ground and doesn't contemplate the gameplay, that it's easy to forget it's there (same with the collectibles). There's a better puzzle game in here somewhere I'm sure.