Game de Check! Koutsuu Anzen

Game de Check! Koutsuu Anzen (ゲームでチェック！交通安全) is a Sega Master System cartridge commissioned by The Tokio Marine and Fire Insurance Ltd. and released in Japan to teach children about road safety. It is one of the rarest Master System cartridges in existence (and the rarest of the Japanese library), being distributed in 1988 but not being sold commercially to normal consumers.

On 29 December 2009 a cartridge was listed on Yahoo! Auctions, but was purchased by a private collector. In December 2019, another cartridge was listed on Yahoo! Auctions and was purchased by Bock and donators from the SMS Power! community for ¥521,000. A dump of the cartridge was released on SMS Power! on 27 March 2020.