From SMS Power!

Videos: Game Gear - US Commercial - Gear Up

http://youtu.be/UUAR8E9tkQw

Games

Castle of Illusion - Starring Mickey Mouse / Mickey Mouse no Castle Illusion (ミッキーマウスのキャッスル・イリュージョン), Wonder Boy (ワンダーボーイ) / Revenge of Drancon

Note: Castle of Illusion footage is from the Mega Drive version.