Me and my sister (5 years younger) enjoyed the original Bubble Bobble on the NES. The mechanics are very simple. The MAME arcade version and the Lost Caves bootleg are both good.
I remember playing BB on PC back in the early 90s..
When I had 45-50mins to spare I would rock it.. If memory serves well, if you reached lvl 20 without losing a life you would open up the bonus levels.