Karateka (Apple II)

Karateka
Developer: Brøderbund Software Publisher: Brøderbund Software Platform: Apple II Released in US: 1984 This game has hidden bonus content.

Karateka is a rotoscoped side-scrolling brawler in which a stiff-legged karate man kicks everything. Even birds.

Upside-Down

While Karateka only takes up Side A, Side B contains a copy of the game modified to play upside-down. According to Jordan Mechner, this was a practical joke by Brøderbund so tech support could have the delight of telling someone that their game was upside-down because...they put the disc in upside-down. Duh.

(Source: Jordan Mechner at San Diego Comic Con 2008)