anyone tried MH on rainbow cruise or icicle mountain - my PAL version crashes every time i try this :/
maybe MH will escape from the screen on these stages ... dunno^^
Amazing Ampharos - you could try plz C: ?
I've tried him on both stages (and every stage in fact). He loads correctly everywhere. Icicle Mountain is probably his best stage (too bad for him it's banned everywhere) since his intro animation makes it hard to avoid an early death and the blast zones are generally small and the movement might force people into his attacks. On Rainbow Cruise, he hangs out on the back of the ship, and he has the disadvantage that his drill etc. all target some place way off the left side of the screen (he does this on Poke Floats and Corneria too, note I haven't tested if he ever gets changed behavior throughout the duration of a moving stage though I strongly suspect the answer is "no"). Going off the side of the stage in general isn't a problem for him; he can't die and doesn't take off-screen damage.
I have done some experimenting with 1p modes...
He works in HRC but is super bad. His entry animation takes more than half of your time, and he has no real effective way to hit Sandbag to the right. I haven't explored it thoroughly yet, but I wouldn't be surprised if it were impossible for him to get a score at all.
He works in multi-man melee, but he can't get a record (it just says "complete" when you beat it with him). His drill move is really, really good in this mode. I was able to use him to unlock Falco; presumably he should be able to unlock DK64 as well (far and away the easiest method for that actually).
If you try this trick on Break the Targets, his intro laugh will play while still on the character select screen and then the game is frozen. It's hilarious.
He works fine in event mode in general (tested with All-Star Match 1), but timed events are tricky since he's so bad other than the not dying thing. Retrying an event with Z does cause his intro animation to repeat. He is capable of scoring records in this mode. The Goomba trophy stage works fine with him, and he can actually target the drill etc. over most of the stage. Likewise, the Entei stage is well behaved and lets him target a wide area with the drill. The Majora's Mask stage is well behaved too, but the drill and friends don't work well here and generally refuse to target anywhere but the left part of the stage. You do have a percent meter when fighting against Master Hand and Crazy Hand in event 50, and if it's possible to do team attack with Crazy Hand I sure can't figure out how (I suspect you have to be on the same team as him to do that though). As an aside, this would be a really easy way to earn the notice for finishing event 51 without any falls if you haven't yet.
Adventure mode is a bad idea. The game loads the first stage with you inside a large rock formation, and the game locked on me when I tried to do his punch the ground move (presumably for want of a target). Even if you avoid locking the game, there's no way you'll ever clear the first stage. Running out of time in this mode is the only way you can ever lose a stock with him though (other than share stock in teams!). I haven't managed to lose my last stock and see what happens since unfortunate items like to spawn on top of me and lock the game; it's not worth spending this much time just to see the game lock because there's no trophy for it to show (though that really is just me guessing at behavior).
The first match of All Star mode works though he has no one to target in the lobby so his moves lock the game, and he has no way of making it into the portal.
Classic locks up for me right away. I doubt it can work at all, and even if you manged to get it to start, there are obviously a lot of things that would prevent you from finishing it.
In short, Event mode and Multiman Melee are both generally worth it. HRC is technically playable but a waste of time. Don't even bother with anything else; it's not completable.
Also, about items, I notice that you're generally not able to use them but can interact with certain transforming items. The metal box and starman both work fine and as expected, but mushrooms seem to like to lock the game (once it didn't though).
About Princess Peach's Castle, a nifty trick on it is to use the grab move. He'll pull his opponent inside the stage and then throw them to instant death. No human would ever fall for it seeing as the grab is one of his easiest to avoid attacks, but it sure makes beating the AI on that stage a lot easier (important skill if you want to do event mode with him). I haven't tested it explicitly, but I bet it works on Corneria too.