Invisible Fifteen

Collect all the numbers in ascending order: from left to right, starting from the upper left corner.
A great way to pass the time, and to train your memory, attention, hand motor skills.
Intuitively simple and convenient interface.
Five levels of the game (3 × 3, 4 × 4, 5 × 5, 6 × 6, 7 × 7).
Blind game mode. (A good opportunity to try your hand)
There is a choice of colored spots. (It also helps to memorize numbers for playing blind)
Game timer with saving the best result (to view, hold the field ** sec)
Movement counter while maintaining the best result (hold ** steps to view)