I’ve been enjoying this channel. He does incredibly bonkers Sudoku puzzles that can look psychedelic, not to mention one can learn all sorts of tricks (that I forget right away as soon as I start a puzzle). Tangent: Also, if you add all the digits in a Sudoku puzzle you get 405. He does Sudokus with no starting numbers and weird rules, with 1 starting digit and chess rules, with colors and shapes and themes and so on. And if logic isn’t one’s Forte, the videos are mellow, have no jarring music, and his voice is soothing… Which qualities are great for sleeping!