15 puzzle is a simple sliding game. Your goal is to arrange numbered tiles from 1 to 15 in ascending order; left-to-right and top-to-bottom by moving puzzle pieces.

Features:
• three game difficulties: easy, normal and hard
•supports any custom size from 3x3 to 8x8
•customizable interface color modes day and night(for those who can't sleep)
•convinient controls: slide, click, hover methods supported
•takes a almost no space on your device