LEGO MOC Locks Box (a level 8 puzzle box) by cheat3 puzzles | Rebrickable - Build with LEGO
Amazon.com: Tangram Puzzle for Adults -Teens - Kids Age 7 and up I Deluxe Japanese Crayon Puzzle Box Design I Wooden Brain Teasers, Mind Bending Puzzles - Level 4 - Difficulty: 8/10 : Toys & Games