"Next to impossible". lol.
I can beat hardest mode WITHOUT CONTINUING 75% of the time! Of course Tetris Attack is my all-time favorite video game, but still....
Ah well, sorry about that, I got a rush of condesendicism and... never mind.
Bowser is really easy (for me, anyway)! I personaly find Naval Piranha on Hardest to be the most difficult foe in the game... Here's a little hint:
On the title screen, hit B, A, L, L on it. Bowser falls like a domino, even though you gave him no distinct advantage. It simply makes it so that the game is lost IMMEDIATLY when the screen hits the top, not like in normal mode, where it pauses a bit so that Boswer can clear that one tower off to the side he always leaves up there.
Anyway, I don't use that trick much anymore, I don't really need it to win....
But I once trapped Bowser so that he had NO possible clears. That is, there was no way possible to make a row of 3 tiles. That amused me...
Anyway, for different endings, it only really changes if you do it without continues. Of course, use the same non-Yoshi character for the 4 Cave of Wickedness fights for a slightly different ending. (I always use Gargantua Blargg. Don't know why, I just always do.)
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What? Someone made a really dumb comment? This looks like a job for...
CYNICMAN!!!!!
That''s right! CynicMan, protector of tactlessness, enforcer of raw, abusive sarcasm!
Cynicman: What kind of introduction is THAT? It''s not even a sentence!