This "one-level-set" is more a CE-demonstration than a full package of game action. It's a little simulation of "Rocks'n'Diamonds" in one level. You can select 9 levels from a "main menu"  (inside a level)  and you can start, cancel, play, finish, solve them in an arbitrary order.

Everybody who knows a little about CEs will see: the main work here wasn't the level design but  the development of the special "level engine". Everything works like in the real game. The player (in the level) presses buttons to operate the game functions. Via teleport he comes into a monitor and can solve the selected levels. Of course the whole has also a "master solution".