This video shows the location of all 8 Keys in the April Fools 2023 build. If you need help on a specific Key, it can be found below.
Super Jump into the ceiling above the Peppino Statue in the Entrance Hall.
You can break through the wall by the door to Floor 2. Continue in a winding pattern to access the previously fake Key.
Roll through the wall below Fun Farm.
Go up where the Floor 3 Pizzaboy Clone used to be. Then crawl right until you can't anymore, and Ground Pound to find the 4th key.
Break into the ceiling to the left of Peppibot Factory.
Ground Pound the floor beneath You bring a light?
Enter and exit the Green Room.
Floats around randomly on the top of the tower.
Now leave the top of the tower and reenter for the finale.