Ka-thunks are a threat throughout the whole World 5 Castle, forcing you to mind your movements through areas they control. You can get a Cat Power-Up early on, and it can be really useful throughout, especially for bypassing Ka-thunks. You also need it to find some of the collectibles.
Green Star #1
A pair of Chargin’ Chucks stand between you and a Green Star Ring. Take them out, and go through the ring to make the Green Coins appear on the swinging platforms to the right. This can be a tough Green Star to collect.
Don’t be hasty when traveling on the narrow bridge patrolled by Ka-thunks. A miscalculated move can result in your taking a hit or simply jumping off the bridge.
Green Star #2
It can be easy to miss the Green Star in this section if you’re sprinting past the rolling Ka-thunks. Look for it at the center of a Ka-thunk. You have to time your jump through it carefully. Chargin’ Chucks in the area can also complicate things.
Stamp
The Ka-thunk gauntlet that hid the second Green Star also contains the Stamp, sitting on a ledge overlooking the Ka-thunks. The Cat Power-Up is required for this item!
Green Star #3
After pushing past the Ka-thunks rolling over the Jump Panels, you encounter a Warp Box to the next area. However, with the Cat Power-Up, climb the wall to the left of the Warp Box to reach the last Green Star.
Boss Battle:
King Ka-thunk
The Warp Box transports you to a platform that is divided into nine connected pieces, and dropping in to say hello is King Ka-thunk, ruler of those pesky obstacles you had to get past in the castle.
Fighting King Ka-thunk is all about paying attention. He will try to roll toward you just like his smaller subjects did. His face will move around inside his spiked frame, which means you’ve got to pay attention to where you stand when he rolls over you. Watch for the warning lights to appear just before he tumbles over, showing you exactly where it is safe to stand.
The goal in this fight is to stomp on the large red weak spot on the back of King Ka-thunk’s face. You have to do this three times to win.
After you hit King Ka-thunk once, sections of the ground fall away from the rest of the arena, limiting where both you and King Ka-thunk can go. Eventually, you’re left in a plus-shaped battleground. Stay calm, and take advantage of any chances you get to hit him. He starts to move much faster, and recovers from a face plant quicker, too. Still, after three hits, the king will fall. Once you reach the Goal Pole, you’ll free the fifth Sprixie Princess, and open the way to World 6!