二人の 力もちが、まるい 土の わの 上で 勝ち負けを きそいます。
相手を わの 外に 出すか、体を 地めんに つけたら 勝ちです。
いちばん 強い すもうとりを「よこづな」と よびます。
Why six school grades, and not N5–N1?
Because that is how Japanese children learn to read. Japan's Ministry of Education fixes exactly which character belongs to which grade — so "grade 3" is a boundary you can verify, not a feeling. Every article here is machine-checked: if a single character sits above its grade, it is not published.
The result: you never hit a character you have not learned. That is the whole reason this product exists.