At the stage number screen during normal gameplay, press Left, Right, Left, Right, Up, Down, Up, Down, B, Left, B, Right, B, Up, B, Down, then A or Start. This activates an internal counter in the game, which counts the number of bombs placed on the stage. When it reaches a predefined value as below, you'll hear a sound and a flower power-up will appear. Obtain it to maximize your bomb count and explosion range, and to get the manual-control primer. Note that this code will only work on the first four stages of each world while your bomb count and range are less than 3. This also only lasts for the given level.

Code	Effect
Place 10 bombs here	Code triggered for Evil World, Area.
Place 10 bombs here	Code triggered for Forest World, Area.
Place 15 bombs here	Code triggered for Cloud World, Area.
Place 15 bombs here	Code triggered for Forest World, Area.
Place 15 bombs here	Code triggered for Ocean World, Area.
Place 15 bombs here	Code triggered for Wind World, Area.
Place 20 bombs here	Code triggered for Cloud World, Area.
Place 20 bombs here	Code triggered for Cloud World, Area.
Place 20 bombs here	Code triggered for Evil World, Area.
Place 20 bombs here	Code triggered for Evil World, Area.
Place 20 bombs here	Code triggered for Forest World, Area.
Place 20 bombs here	Code triggered for Ocean World, Area.
Place 20 bombs here	Code triggered for Wind World, Area.
Place 30 bombs here	Code triggered for Cloud World, Area.
Place 30 bombs here	Code triggered for Evil World, Area.
Place 30 bombs here	Code triggered for Forest World, Area.
Place 30 bombs here	Code triggered for Ocean World, Area.
Place 30 bombs here	Code triggered for Ocean World, Area.
Place 30 bombs here	Code triggered for Wind World, Area.
Place 40 bombs here	Code triggered for Wind World, Area.