Ever wonder how the Giant's Mask works? Well let me fill you in...
The Giant's Mask does not actually make Link bigger (shocking I know). There are actually two area's for the map. The normal, large, version and then a smaller one which is placed high above the normal one. When the player equips the mask they are swapped to the smaller version with their position translated accordingly. Some adjustments are made such as the camera and Twinmold's size to make Link appear to now be "large".
Hidden within the small version of Twinmold's Lair.
Hidden by one of the trees near the Peahat grotto.
The Giant's Mask which only works in Twinmold's Lair and nowhere else.
Hidden near the Hero's Bow chest behind one of the trees.
The Giant's Mask consumes magic power and if the player runs out they will be forced to take it off.
Hidden on the climbing wall. An invisible platform is placed under it for the player to stand on.
The Eyegore who is protecting the Giant's Mask chest.
Hidden in the Eeno room behind one of the stone pillars.
The Giant's Mask again.
Hidden in the right barrel in the Aveil's throne room.
Equipping the Giant's Mask makes Link get very "big".
Hidden under the table in Lulu's room.
Twinmold's Lair.
Hidden on top of the second level blocks.
In the Japanese version of the game the english translation for the name of "Stone Tower" is Rockville.