I think most people who've played this game are probably familiar with the C64 version over any of the others, as pretty much everyone I knew who had a C64 while I was growing up had this game. Also, while this was originally a PC Booter game, meaning you had to boot your PC while the game was loaded into your disk drive, it's since been converted over to run from DOS, which is why it goes nuts when you hit ESC. That said, DOSBox can handle PC Booter games too in their original state, provided you have the disk image for it!