Inside the last chapter of a very obscure Japanese-only Nintendo-made Tingle game(you don't see those too often), there's a reference to the not-so-obscure Samus' Morph Ball ability and the famous Metroid tune. Nintendo squirrels away the best bits of gaming far away from us sometimes.
Tingle no Koi no Balloon Trip is by no means a bad game either- if you have the chance I recommend an import.
