A shoot ’em up/gravity game on the Sega Megadrive/Genesis that is a massive amount of fun to play. It really is one of those obscure little titles that is a pleasant surprise to discover.
Released in 1993/1994 (depending on where you lived) and developed by Zyrinx and published by Scavenger. The smooth scrolling and fast-paced blasting action requires skill and dexterity to progress, and there is plenty of satisfying pixellated destruction along the way.
A fantastic blast from the past. well worth tracking down if you haven’t played it before.
More: Sub-Terrania on Wikipedia