Think's avatar in Poptropica is Speedy Catfish. He wears the Albert Einstein costume, but added the limited edition red glasses from Vampire's Curse Island.
He does every island twice without any walkthrough.
The first time is for his Road to Captain Thinknoodles series, where he figures it out by himself. It is published after the walkthrough.
The second time he replays the island is for his walkthrough, which is published first on his channel. He knows what to do this time, so if you want to beat the island it is recommended you watch the walkthrough.