Puzzle toys for smart birds

My umbrella cockatoo is too smart for most toys — figures them out in 5 minutes and then gets bored. What are the most challenging puzzle/foraging toys you've found? I need to keep that big brain occupied!

My Coco went through a phase like this around 8 months. I was terrified but it passed. Birds are weird sometimes lol.

This is peak Amazon parrot behavior honestly. They wake up and choose chaos every single day and we love them for it.