Helping my nephew play this game he just got for his Wii, and have encountered something quite odd after choosing to play the "Monkey Island" world; at the level-select screen, all the level number--with the exception of 7 & 8--are grayed out, and may only be played in practice mode (by pressing "A" while holding down "B"). Only 7 & 8 may be played outside of practice mode.
I've consulted the manual to no effect. I've also spend about 30 minutes researching this on the Net, and found nothing.
If any clues can be given as to what we're missing, it'd be appreciated--we really want to play from level 1 onward.