Pool - Back Access
From the Super Mario Wiki, the Mario encyclopediaJump to navigationJump to search
When Luigi first enters the Back access before the boss battle, he won't be able to enter the Pool since it's blocked by a bunch of towels. The is a treasure chest near the bench that Luigi can use the Dark-Light Device to reveal and obtain Bills and Coins. There's also a trash can near the stairs filled with gold bars, bills, and coins by using the Dark-Light Device.