its the elevator one, I've found a lollipop but I dont have access to floor two yet
If you use the lollipop during your fight it can help heal you! Also keep an eye on your "ENERGY", if you have enough, you can double-attack!!
that what I've been doing :) I've also been trying to get a drink from the vending machine [I've already unlocked the elevator] and it just gives me the item again