Puzzle: Underwater World is a classical puzzle game invented in 1878, it’s still popular today. The sliding puzzle that consists of a frame of numbered square tiles in random order with one tile missing. The object of the puzzle is to place the tiles in order by making sliding moves that use the empty space. The game 15 puzzle is made in three different sizes:3 х 3 (8 tiles) – for beginners and kids4 х 4 (15 tiles) – classical size fifteen puzzle for all ages5 х 5 (24 tiles) – for those who like to thinkFeatures: Three levels of complicity (8, 15, and 24 tiles);Algorithm that excludes unsolvable combinations;Realistic animation and tiles slidingMoves counter and timerFriendly interface with color themeOnline records servicesOptimized for PCInfoA sliding puzzle, sliding block puzzle, or sliding tile puzzle is a combination puzzle that challenges a player to slide (frequently flat) pieces along certain routes (usually on a board) to establish a certain end-configuration. The pieces to be moved may consist of simple shapes, or they may be imprinted with colors, patterns, sections of a larger picture (like a jigsaw puzzle), numbers, or