In Double III and higher, enter switches weapons for Player 1, while tab does the same thing for the other Player. If you try running it just as it is, it won't work . Stephan found 100000 to be sufficient. I am extremely proud to say, dear readers, that this is the worst two-player game ever invented. And it was I who inflicted it upon the unfortunate world.
Controls are the same as the previous versions, but the change in interface was radical indeed.
Double III was the first Double that I could look back at without derision and a feeling of queasiness. I like it. You can change the controls if they're too weird for you. This file has unzipping rules. Oh, and the code's full of bugs.