日本以外の国ではゲーム特許を取得することができない
らしい?
@reduzio: Developers in the West are likely unaware but, in Japan, game patents are a thing (Pocketpair is Japanese). A long time ago, when a previous studio I owned worked with Square Enix, they had register/check for patent clearance for our game.
It's why no DDR clones look like it.