15 puzzle challenge free

This is the first 15 puzzle in which you can challenge your friend with the same combination of numbers that you solved! 

Once you have solved the puzzle in "Classic" mode click on the "Challenge a Friend" button!

Do you think to be the faster to solve this puzzle? 

It's also called Slide Puzzle, Block puzzle, Gem Puzzle, Boss Puzzle, Mystic Square, Brain Puzzle, 15 Solitaire. 
It is a game of intelligence and velocity!

This is the full version of a funny puzzle quiz  composed of numbers. The best way to keep your brain trained.
Suitable for  children, kids, men and girls of all ages. It improves your cognitive skills, you have to think fast and act fast like a ninja. At first it may seem complicated and can make you angry. But then when you solve it you will feel the best!

In this version, of the 15 puzzle online, you can play CHALLENGE, CLASSIC, and ARCADE mode.

*CHALLENGE  MODE:*
Challenge your friend with the same combination of numbers that you solved! 
Once you have solved the puzzle in "Classic" mode click on the "Challenge Friend" button!

*CLASSIC MODE:*
You have to finish game as soon as possible to increase your score. You can play one grid per game.

*ARCADE MODE:*
You can play in different levels of difficulty easy/normal/hard. In this version there are 9 levels to complete as soon as possible to increase your score.

Additional features:
* You can choose different grid sizes and skin colors
* Local Highscore mechanism
* You can reset your score