Diggers (CD32) I have completed that game many times!
I don't know what it is, but I just love Diggers, especially with that atmospheric background track.
I also have Diggers for PC, and the original CD version of Extractors. I've yet to actually play Extractors properly though, (due to it running too fast) I haven't used DosBox yet, so I hope to get it working properly with that sometime.
I'm awaiting the remake of Diggers, but you can't beat the original version. That was perfect in every way for me.
I have the original Diggers/Oscar CD32 disc, so when I feel like playing, I fire up WinUAE and play!