"521 + 479 = 1000 ... hence the name. This puzzle is based on Choronzon, which is based on Fermium and thus it uses human designed moves or at least until near the liberation of the first piece. Because of the 13 pieces in this design it uses different sizes of pieces and thus it's easier to calculate all the possible assemblies. It's not unique by itself but becomes unique by adding a big "M" on the top like in the picture. Notice how it has 521 moves for 13 pieces so it has more than 40 moves per piece!
I believe this will be my final puzzle when it comes to "hugeness". Firstly because there is little point in making puzzles that no human would ever want to solve and secondly because the computers of today can hardly even grasp this hugeness. Finding the solutions for Millennium or Choronzon or similar designs takes between 5 and 15 minutes in burrtools and this makes it a tedious job to envision, test and adjust these designs. For comparison: Fermium takes one second."
- Millenium in difou, partially open
- Millenium in beech (back)
- Millenium in beech (pieces)