Top 1 Games Similar to Speed Puzzle

Please input the sentence that youwanttotranslate here. The input language is judged automatically.I move a number with an empty trout and am a classicpuzzlegameto sort at the position same as completion form.Because it becomes a thyme attack system, please sort it assoonaspossible.With 15 puzzles which there are 15 pieces on a board of4x4There are 8 puzzles which there are 15 pieces on a board of3x3.I am called the sliding block puzzle.