|Portable Driller, and this would be a real dream-come-true if it weren't for Mr. Driller A having stolen its thunder in almost ever conceivable way.|
Howesomever, 2 contains a Time Attack mode that A doesn't have and it's a bit different than in the first Mr. Driller as it starts to throw real puzzles at you with collectable tokens that flip or rotate the screen around, allowing you to get by otherwise impassable sections of steel bricks. Needless to say this is quite tricky and requires a good deal of memorization, I think, and I'm only on the first tier still.
I kind of prefer just straight twitch drilling, if you know what I mean. The music isn't even all that great in this outing. Not bad, mind you, but there's better Driller out there.