noun
15 puzzle; game of fifteen; 4x4 sliding puzzle
A classic sliding puzzle with 15 numbered tiles in a 4x4 grid; the goal is to arrange the tiles in numerical order by sliding them into the empty space.
子供の頃、十五パズルでよく遊んだ。
When I was a child, I often played with the 15 puzzle.
このアプリには十五パズルが入っている。
This app includes a 15 puzzle.
A broader term for sliding puzzles; 十五パズル is a specific classic 4x4 version.
From 十五 (fifteen) + パズル (puzzle). The puzzle is named after the 15 numbered tiles.