Invisible 15-Puzzle

This game is an unique 15-puzzle inspired by World's Hardest 15-Puzzle by ElGregos. 

FETURES:

• Puzzle + Memory game.
• The numbers only show 5 seconds on the board,  please try to remember them as soon as posible.
• Limited only 300 steps to solve it.
• You can challenge your best moves after replaying the game.