> For the complete documentation index, see [llms.txt](https://firefirebook.firefirestyle.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://firefirebook.firefirestyle.net/tetris/fall_tetromino.md).
# テトロミノを落下させる
自由落下の機能を追加します。
## (1) 一定時間経過すると下に移動する
## (2) 確認する
### (2-1) 右上(みぎうえ)の緑色(みどりいろ)の旗(はた)をクリックする。
### (2-2) ドミノが自由落下すること
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