Digger © 1983 Windmill Software

https://en.wikipedia.org/wiki/Digger_(video_game)

This is the game from my family’s PC AT that I go back to regularly,. But for convenience I usually use the WinDig port:

Windig, the Windows 95 version of Digger Remastered (87K). This version is rather new. If you are having trouble with it, try the older version (95K).

https://www.digger.org/download.html

I just used web archive to check and it looks like the 87K version and its description as “rather new” has been there for 21 years now. It was built to target Windows 95 and is still working on Windows 11 so at this point i would say its “pretty stable”.