FULL VERSION, WITHOUT ADS!Legendary mathematical game right on your device!Try your logic skills and pass one of the most exciting mathematic tests ever. 15 tiles only to put them in numerical order. Its not so easy as it seems to be! This simple puzzle became a classic logical game for several generations. Check yourself and practice more to achieve the best result!How to Play: the field consists of 15 enumerated tiles and an empty space. Move the tiles to place all the numbers in order. Do less moves to get the best score! Features:- Classic logic challenge!- Well-known rules!- Choose a level of difficulty!- Great brain trainer!