This page details bugs of Flipull (Game Boy).
Bugs listed here are present in all versions of the game.
Unbeatable Stage 49#
The game's manual claims that there are 50 stages, but in reality there are only 48. Furthermore, there's no check for beating Stage 48, so the game will load unrelated data as Stage 49, making it unbeatable because the Block counter (denoting how many blocks are currently on the field) is glitched. Stage 49 therefore acts like a kill screen.