Willy and the Dodecahedron
Willy and the Dodecahedron is a remake of the ZX Spectrum game Jet Set Willy, written by Matthew Smith. It's a set of new rooms for the game, edited using Jet Set Willy Editor, written by John Elliott.
The game is a JSW64:V game, which means you'll need to emulate a 128K Spectrum to run the game. There are two downloads: