Here is our list of known Secret Item locations throughout the game, and how you get to them. So please contribute with your discoveries, and how you got to them. That way we can add to this list.
Types:
Red Ying Yang
Golden Dragon
(list to be added soon)
Goro's Lair
Wu Shi Academy
Evil Monestary
Living Forest
Soul Tomb
Wasteland
Foundry
Netherrealm
Types:
Red Ying Yang
Golden Dragon
(list to be added soon)
Goro's Lair
Wu Shi Academy
Evil Monestary
Living Forest
Soul Tomb
Wasteland
Foundry
Netherrealm