Super Mario RPG Remake: How to Obtain the Bright Card + Finding Grate Guy's Casino
One of the more elaborate secrets in the game is Grate Guy's Casino, where three minigames can be played. The first step to finding this unique place is returning to Booster Tower, where Knife Guy now hosts a juggling game. If you can pick the hand Knife Guy holds the yellow ball in a total of 12 times, he will award you a Bright Card, the item necessary for accessing the casino.
To actually reach the casino, you must go to Bean Valley. One of the five pipes in the area with the Save Block leads to a room with a Chomp Chomp, a unique variant of Chain Chomp that only appears in this one location and nowhere else in the game. Jumping three times in a precise place near the Chomp Chomp will trigger a platform and secret exit to appear. Leaving Bean Valley through this exit will add Grate Guy's Casino to the map, and when you go there, the Bright Card will convince the guards to allow you in.