Here is the "Japonica Keitai Nouryoku Trainer" (Sega Toys). --- Released in 2005, this trainer was supervised by a medical doctor and designed to activate the prefrontal cortex of the brain. The retro colors are reminiscent of the Showa era, which is nice! How about adding it to your retro game collection? It can also be used as a keychain. --- [Condition] I confirmed its operation when listing it. [How to Play] There are three brain training modes.