muuPuzzle4 Is the so difficult four cards Sort

This APP is just a game rearranging the four cards.
But why is it so difficult?
If not carefully considered, it irritated amissing.

• Start with the four card(0,1,2,3) are sorted randomly.
• Please replace the card, and rotate.
• The card arranged in the 0, 1, 2, 3. and game is complete.
• There are two or three layers, all layers must be arranged in the 0, 1, 2, 3.
• Replacement of the card is linked layers, but rotation of the card is not linked layers.

Come on, please enjoy a simple game.