Board Thread:Fun and Games/@comment-31725359-20161119180825/@comment-29790859-20161204163654

There are 12 rooms because...

All the way back, Rare Grumpyre says, "You've solved 25% of the puzzles. Just 9 more to go. Hehe. These won't be simple codes anymore..."

25% = 3 rooms, 3 + 9 + 12.

Also, we're at room 8/. 7/12 rooms were solved.