Working to solve the Flash DOOM engine,the first step was DIABLO engine (!?!).
What can you do at this stage:
- walk around the maze
- sword training
- read the book
- open the sarcophag
- watch the nude girl (!)
The "SwapDepths engine" eats a lot of resources.
Required system (to achieve 25 FPS): P4/1.4GHz, 256 MB RAM, GeForce2MX
(close all other windows to obtain the highest speed)

http://necromanthus.com/Games/Flash/diablo.html
(KoolMoves version soon !)