What is your favourite obscure retro game, that you think everyone should know about?

Mine is Hogs of War for the PS1. It's a really great worms style game (but way better in my opinion). You can upgrade your pigs with promotions, and that changes their inventory so not the whole team has one single inventory but every pig has his own. The whole thing is voiced by Rik Mayall a British (if I remember right) comedian, and he does a really great job. It parodies stereotypes a bit, for example half of the Russian's voices are drunk ("I think I have to press...... this button.") It has a PC version althought it's not as good. The PC version doesn't have music, cutscenes, and the AI plays in artillery style. Ironically when I was young and I had the game for PS1, I played it so much that the CD actually broke.

I wonder what gems can turn up in this thread.