Very. Playing the ROM in VBA seems to have a few problems however. Like it won't save >_<
Also the sound and music are off by default
And for some reason only Time Attack works - the other modes don't have any puzzles.
And if you try to change the tile colours in the options, the tiles don't show at all.
I'm guessing this is either a bad dump, a beta, or VBA simply hates it (I haven't tried it on my flash cart... yet).
Oh well, off I go to play the new HM game
(the one with the guys in your sig).