The original Oregon Trail was indeed written in BASIC, on a CDC Cyber. The source code is available. I once ported this to applesoft basic to try it out. This was a text-only game.tepples wrote:MECC's The Oregon Trail was in BASIC.
The popular Apple II version by MECC I'm not sure about. I wouldn't really assume it was written in BASIC, but it doesn't seem implausible either.
(BASIC was certainly used for commercially viable software over the years, though. I am not questioning that, but I don't really have any specific examples of 8-bit titles that did in hand. I know of many on Atari ST.)