Ball comes back
During play, if you lose your ball, press UP + A.

Bonus Games
Press R, Select and A for a secret that can take you straight to bosses, and L, Select, A for a bonus game cat and take you directly to bonus games.

Reset the High Scores
For those of you who've forgotten how to reset the high scores and have lost the instruction manual, here's how:

At the title screen, press A or B to see the High Scores. Then hold DOWN and SELECT and press START. A bomb will land on Kirby's head, followed by an explosion. Look again and the High Scores will be like they were when you first played it.