- Tetris Guideline
https://harddrop.com/wiki/Tetris_Guideline

- Tetris Guideline Docs
https://tetrisconcept.net/threads/tetris-guideline-documents.1799/#post-52423

- ミノの回転入れ
https://tetrisch.github.io/main/spins.html

- Mino: iPhone Demo
https://www.youtube.com/watch?v=YNh8lBrhEM4

- A sad day for fangame makers: Tetris Holding, LLC v. Xio Interactive, Inc
http://harddrop.com/forums/index.php?showtopic=4483

- Tetris Holding, LLC v. Xio Interactive, Inc.
https://www.loeb.com/articles-ipentertainmentcaselawupdates-20120606-tetrisholdingllcvxiointeractiveinc

- 上原テトリス　クリア
https://www.youtube.com/watch?v=TK3ME1EDfHE