Cubicdissection.com - Portal is Dee Dixon's newest Sequential Discovery Puzzle Box. Dee's earlier works like Where's my Hammer and Space Case have been very well received by the puzzle community. Portal carries
PuzzleMad: Not a box! A sequential discovery puzzle with a cavity!
The First Box sequential discovery puzzle by Wil Strijbos – New2Play
Dragos - The ultimate sequential discovery puzzle box on the planet!! Real diamonds, and silver among other semi-prec… | Puzzle box, Leather bound journal, Puzzle