Mr Driller

Mr Driller from Namco[?], 1999, 2000 is an insanely addictive puzzle game that has you, in the guise of Mr Driller, working down through screens of blocks.
Imagine Tetris in reverse, that is, the screen is already full of bricks and you have to work through them, and you'll be getting the idea. The two main challenges is to drill through the blocks whilst keeping your air supply topped up with air capsules that are buried and to avoid being crushed by falling blocks.