Try this extremely difficult model and puzzle in one!
It took me 500 hours to build this puzzle
Architecto - Wooden DIY Puzzle Box Kit, Wooden Models & Kits
Puzzle Insider Ep 8 lists great puzzles. What's your go to puzzle to share with friends?
ARCHITECTO PUZZLE BOX by NKD PUZZLE — Kickstarter
Kit Puzzle Box ŒnoLogic
The NKD Multicube SOMA Build
Puzzle box Architecto in Kit (by NKD PUZZLE)
NKD Puzzle - Wooden 3D Puzzle for Adults - Brain
NKD Puzzle Architecto Puzzle Box Bausatz: : Spielzeug