I'd interpret the question as last (mainstream) DOS game made. As in sold in retailers and therefore somewhat known. And IME it's probably the WWII shooter that used Build engine.
It's a long one, but it tries to answer when the first video game was made. Most of it, though, is trying to figure out what it means to be a video game in the first place. Sometimes really the trouble with the question is the lack of precision in the definitions involved.
Thanks for posting this, will certainly check some of these out.
[1] https://www.youtube.com/watch?v=kSKeWH4TY9Y&t=8s