This is a fifteen puzzle game, also known as "Gem puzzle" or "Game of Fifteen".

On a square play field 4x4 sizes there are 16 sections 
with fifteen gems (jewels) in them and one section is empty. 
Each gem has a number on it relatively from one to fifteen.
All gems appears to be placed in random order.

To solve the puzzle move jems using empty section to arrange them
in sequence from one to fifteen.

To move jems just swipe them (or drag-and-drop) with touch or mouse.

Use "Reset" button to mix jewels and play again!

Have fun and good luck!:)

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(1 edit)

Pretty sure this puzzle sometimes outputs an unsolvable state. 

https://puzzling.stackexchange.com/questions/25563/do-i-have-an-unsolvable-15-pu...

I'm thinking about making one of these myself.

Friendly suggestion: 

itwould be nice if you didn't have to drag the piece to move it. If just clicking worked that might be ideal.