Crazy Four Math Logic Puzzle on Keychain

Mathematical logic puzzle Crazy Four on a key chain. Place the 4 dissimilar colored cubes inside the case, so that each side consists of 4 different colors. Contains 2 more combination puzzles.
Take on the mental challenge of ‘combine-match’ by employing concentration, imagination, logic and patience.
With 4 handmade wooden cubes in a wooden case.
Size: 1.7 X 6 and height 1.2 cm.