This APP extended the classic Fifteen Puzzle to triangle and hexagon. Added fixed blocks and irregular board mode. There are THREE modes, THREE shapes. Each have SIX difficulty level. Think hard at every level. It is very suitable for mental exercise, development of young people's intelligence, or leisure entertainment. New play, new challenges, new feelings. Main features: Three play ways: Classic, Fixed block and irregular board mode. Three shapes: square, triangle and hexagon. Six difficul