Electronic Game Arcade Business Regulation Act Article 7

An operator of electronic game arcade business may not display or use electronic game machines that have not been reviewed, categorized and announced by the central governing authority, and may not arbitrarily modify electronic game machines that have been reviewed and categorized.For the electronic game machine of which the machinery configuration or software has been modified, it shall be considered a new machine model, and shall immediately apply for inspection and categorization review in accordance with pertinent rules.
中文原文 電子遊戲場業管理條例第7條
電子遊戲場業者不得陳列、使用未經中央主管機關評鑑分類及公告之電子遊戲機及擅自修改已評鑑分類之電子遊戲機。
電子遊戲機之機具結構或軟體經修改者,視為新型機種,應即依規定申請檢驗及評鑑分類。

English translation for reference only; the Chinese text prevails. Not legal advice.