After I beat the boss behind the key hole...what do i do??

and also were are the puppies in Halloween town and the Hallow Bastion??

You need to specify which keyhole you are talking about, or else we can't answer the question.

I think he's talking about the one in Hollow Bastion.

After that, go to the next level, what's so hard?

I think he means where is the next level.

Not too hard to see, its that place that looks like a world that hasn't been revealed yet.

go to the next world or something

you have to go back to traverse town then you need to talk to cid.

plus i don't know where dalmatians 64,65,66 are but i know they are in halloween town but i have made a list of the other i'll just go and find them on the shelf across the room...which meens putting the laptop down...there we go...be back in a jiffy...(three minutes later)...Hello i'm back,i've listed the dalmatians below hope it helps.

halloween town

40,41,42: in the bridge bit before oogie manor.
67,68,69: in Guillotine Square. pull the doorbell on the house at the top of the stairs three times then look underneath the stairs
70,71,72: in guillotine square.in the grey pumpkins mouth.

Hollow bastion.

61,62,62: in the grand hall,Accessible the second time you visit here.
91,92,93: Bottom of the rising falls.
94,95,96: Castle gates cast gravity on the floating chest.
97,98,99: High tower cast gravity on the floating chest at the place where you climb up the big blocks.

wow thats pretty good