슈퍼 마리오 어드벤스 2 - 슈퍼 마리오 월드

Play as Luigi:
Press R at the world map.

Ending bonuses:
Successfully complete all 96 goals to get another color scheme for the world map, alternate enemies, a new introduction sequence featuring Yoshi, and other changes. You will also be able to start at any location on the map. Press Select at the main screen, then select a level at the status screen. Press A to start at that level instead of moving to it on the map.

When you complete all levels in the game, the Koopas will change into Mario bobble heads.

Retro stage:

Clear all the five levels on Star Road by finding the hidden keys and locks in all of the levels. When you do this on the fifth level, a warp star should appear on the hill in the middle of the map. This will take you to the Special Zone, where you can play on 8 retro levels.

출처 : http://www.gamewinners.com/game_boy_advance/SuperMarioWorld.htm