I saw a Mr. Driller coin-op arcade game for the first time  at the recent PGX show.  I always liked this 1999/2000 game, so popped it in my Dreamcast and I've been playing it.  The bright pastel colors, animation, sounds and music are top notch and pleasant, which isn't surprising for a Namco game. Even when I lose, I've still enjoyed the round. 

Price charting shows the game between $25 and $40 for a loose disc, well over $100 for complete.

 I played and beat the easy 2500 depth challenge first.  Changing the difficulty from easy to normal to hard appears mostly to affect how quickly your air runs out, and it does get challenging on hard, forcing you cut across the colored blocks horizontally, just barely keeping ahead of the falling columns in your wake.

Then I started to attack the expert 5000 depth challenge, and have not reached the end quite yet, but I did beat Cafeman Jr's 10+ year old high score, still saved on my VMU.  I took a picture of the score screen and texted it to him, saying I WIN.  

It's a genuinely fun game, good for a quick play or multiple tries.   Survivor and Time Atack modes are also welome modes, fun for a while.  I disagree with the sticker statement on the box that states "Dig Dug meets Tetris" by GameWeek magazine (who?).  Tetris is based on fitting shapes, not matching 4 or more blocks of color. So "Dig Dug meets Columns" is a better analogy.