Forest of Fear
Forest of Fear is a level found in Wario Land 3. It is located in the east of the Music Box World and is unlocked after the player gets the torch in Castle of Illusion which opens the path for this level. The red key card and the blue key card are found in this level. This level is a creepy forest with scary trees, bird-like enemies and zombies. Its music is an eerily silent tune not heard elsewhere in the game.
Treasuries
Gray Chest: Warp Compact
To get the gray key, Wario has to climb a series of vines avoiding spikes and some flying birds and go to the left side of the forest. As for the treasure,he has to climb the vines again, but to the right this time.
The Warp Compact unlocks The Warped Void.
Red Chest: Key Card (red)
After getting the Mystery Handle in the Warped Void, Wario has to go to the platform where the Grey Chest was, but this time, he has to enter the pipe near. Then, he has to use the Bouncy Wario ability to get the red key to open the chest. He has to use the same ability to reach the red chest.
Green Chest: Warp Removal Apparatus
Wario has to enter the pipe again. But this time, he has to use the Vampire Wario ability to reach the green key. Then, he only has to pick up a Spear Head and use it to break the blocks on the right side of the room to reach the green chest.
The Warp Removal Apparatus is used to make the dimensional rifts disappear in The Warped Void.
Blue Chest: Key Card (blue)
After the Magic Potion summons Zombies in Forest of Fear, Wario has to enter the door in the left side of the forest and use the Zombie Form to get the key and open the chest containing the card.
The Blue Key Card, along with the Red Key Card, releases a Para-Goom in The Warped Void.
Reaction Abilities in this Level
Screenshots
Wario climbing the vines. 
Bouncy Wario. 
Vampire Wario near Miniculas.
