In perhaps the most famous switcheroo in all of game history, the Japanese version of Super Mario Bros. 2 was declared "too hard" by Nintendo of America and replaced with a Mario-ified port of the Famicom hit, Yume Kōjō Doki Doki Panic. The new game (dubbed Super Mario USA in Japan) was a huge success for its four playable characters, improved graphics, immersive levels, and catchy music, and eventually became the 3rd bestselling game for...