This is the first level we are tackling in the last region of. Once you have exhausted Fury Bowser's HP meter twice, you will unlock the raised section of the lake which is completely covered in Fury slime. You will need to navigate to Wasteland Giga Bell Island where you can access three levels. One of them is blocked by glue, so we start here.
Scamper Shores | Fort Flaptrap | Pounce Bounce Isle | Slipskate Slope | Clawswipe Coliseum | Tour Trickity | Château Crisp Climb | Risky Whiskers Island | Tour de chemin de tuyaux | Mont Magmeow | Roiling Roller Isle | Île de Fur Step
Riskey Whiskers Island 100% Completion Guide | All the cat shines and the cat parts
Chat Shine # 1: This one is easy. The first Shard of Brilliance spawns Fury Shadow Luigi - chasing him in this level is hard, so hit [R] and send Bowser Jr. to attack him instead! Three shots and you can aim any distance.
Cat Piece # 1: Let's go clockwise in a circle around the level. Starting from the cat door, go left and you will see this room floating above the timed platforms.
Cat Piece # 2: Continuing clockwise, you will see this one in the back left corner.
Cat Piece # 3: Behind the lighthouse, in the center of the flat area. Climb the steps of the falling platform to reach it.
Cat Room # 4 + # 5: Both are on the home straight, on the right side of the starting gate level. You can't miss them.
Chat Shine # 2: Collect the 5 cat coins to earn this shard.
Chat Shine # 3: After clearing the black silt below the main area of the level, descend to the island and you will find the Bowser blocks in the center. Wait for Bowser to appear to blow up the blocks!
Chat Shine # 4: When you return to this level, it will be covered in Fuzzies - weird little creatures that you normally can't defeat. To get the Shard of Brilliance here, grab the Piranha Planter and wear it near the Fuzzies. The plant will devour them. Eat all the Fuzzies on the level to gain the Shard of Brilliance.
Chat Shine # 5: A new button will appear when you come back later. It's an obstacle course challenge - sprint to the end and don't worry about avoiding the big bombs. When Mario hits them while running, he kicks them out. Use the last two bomb bullets to pierce the wall.