Greetings! This is Nathan Curtis, the "Tortoise" of Tortoiseshell Studio. I write a wide range of puzzles, specializing in variety grid puzzles and puzzle hunts, and you can find a sampling of those puzzles here, as well as periodic musings on puzzles from both a solver's and a constructor's perspective. Some of my puzzles have appeared in Will Shortz's WordPlay, and I have written and edited puzzle hunts for the Boston Area Puzzle Hunt League and the National Museum of Mathematics. If you would like to know more, please feel free to contact me. Enjoy the puzzles!