Circelei IPP26 Exchange Puzzle by Henrik Haak
IPP21 Burr, Exchange Puzzle from Mr. Puzzle, Brian Young
Puzzle Auction - IPP Puzzles
Quintet in F (Exchange Puzzle IPP 31)
Puzzle Auction - IPP Puzzles
IPP anti Slide puzzle | Very unusual goal | Mr Puzzle
Neil's Puzzle Building Blog | The journey from puzzler to puzzle creator. | Page 2
The original B Lock By Boaz Feldman – New2Play
IPP Martian Diamond | George Sicherman | Mr Puzzle
Jerry's Mechanical Puzzle & Brain Teaser Collection: IPP34 - Edward Hordern Puzzle Exchange
FantasTIC - IPP Design Competition entry – Wood Wonders
The Pentagon Tiles. IPP 32 Packing Puzzle by Marcel Gillen Design by René Dawir | eBay
Plus! Puzzle! Burr Puzzle Edi Nagata IPP 30 Exchange Puzzle 🧩 | eBay
Very difficult 3 piece packing puzzle | IPP | Mr Puzzle
IPP 29 Puzzle Lot - Revised
LOT of 4 IPP Puzzles plus one
Andreas Röver - Puzzles
Oak Wood High Difficulty Puzzles Bitten Biscuits - Etsy
IPP wooden Burr 14 piece by Brian Young – New2Play
Puzzle Design Competition Archives | JL Puzzles
2016 Design Competition Results
5 IPP Puzzles Packing and Poly shapes Lot 2
