Unlock the following items by performing the corresponding tasks:

ITEM - HOW TO UNLOCK
Dynamite - Get the bomb in The Bat-infested Abandoned Mine.
Elixir Of Immortality (Fake) - Talk to the Wise Boy in the cave. Note - You can only choose one of the potions.
Flashbang - Obtain the flashbang grenade in The Bat-infested Abandoned Mine.
Old Compass - Bring the Mushroom to the Weedy Spelunker.
Poison Mushroom - Search for the Mushroom outside the cave.
Speed-up potion (Fake) - Talk to the Wise Boy in the cave. Note - You can only choose one of the potions.
Stone Slab (Earth) - Use the key on the door at the end of The Bat-infested Abandoned Mine Cave.
Underground Key (Red) - Obtain the key in The Bat-infested Abandoned Mine Cave.