Earlier quoted context omitted.
Yeah, the game's written in the QBASIC language but I certainly don't use QuickBASIC 4.5 or PDS to compile it.
Sorry to nitpick, but "QBasic" is an IDE (Just like QuickBASIC, which incidentally is the predecessor of QBasic). The language is just called "BASIC". Also you're not compiling anything. It's all interpreted at run time (which is why performance is dog slow).
Often at the time, you could write some code using the free QBASIC which came with MS-DOS and then decide that you need to purchase one of those other programs to compile it prior to distributing it as a standalone executable.