Pop'n TwinBee \ TwinBee da!! for GameBoy secret cheat revealed
Collect "eye" bell bonus item, then press Start to pause the game, and input a Konami code (UUDDLRLRBA). Unpause the game to activate the secret behavior for triple shadow twinbee, which is no more collapsing to the main object while standing still.
The effect disabled after the first dead, also can't be used one more time during the current game.