> I also did a lot of testing with the original game, running it in DOSBox and on original hardware (various 386 and 486 machines which I got from eBay). I buil

> I also did a lot of testing with the original game, running it in DOSBox and on original hardware (various 386 and 486 machines which I got from eBay). I built test levels for focused observation of specific enemies and game mechanics, recorded video captures of these using DOSBox, and stepped through the recordings frame by frame to verify my findings from reading assembly code. Once I had implemented an enemy or game mechanic, I would also typically record footage from my version, and compare it to the original frame by frame to verify the accuracy of my implementation. The developer put in a tremendous amount of work! The wonderful thing about programming, is how the product of your intense focus can be shared with so many people. There are people who have built super detailed model railroads but you will never see them unless you visit their basement. With software, just about anybody can build/run/play this game that has been so lovingly and painstakingly recreated.