From the Infinity conference a few years back in Ann Arbor, Michigan. I gave a talk on knight mazes and began the talk with a puzzle. You are a chess knight. Start anywhere you like on the left edge of this board and reach the star by moving only legal knight moves on the white squares. You may not leave the board or land on a blue square.
It's a maze I designed especially to be difficult. Give it a try! The talk focused on interesting maze elements and concluded with an analysis of this maze and the key to why it is so challenging.