The 16 fields of 4 × 4, are lined with marked cards for the numbers 1 through 15. 16th is blank.
When you tap the START button, the game is started.
Card is randomly ordered, the time count begins.
Compete for time until the card back to the first order.
Using a blank, let's move the card.
Mass card by one toward the blank rows and columns, up to three can be moved.
Returning to the first sequence, "CONGRATURATIONS" is displayed, the game is completed.
The rule is simple, it stimulates the brain!
Clearance time to perfect mental exercise.
Come, please enjoy.