Created by Nintendo R&D1. Received for 6th birthday along with Tetris.  Another game that I played a lot, couldn't beat, got frustrated with and left alone.  Then, years later I picked it up again and beat it within a few hours.  Definitely maps my fine motor skill development.  One interesting thing, though, is that I memorized the location of probably every secret and invisible block in this game, without any kind of walkthrough or guide - it was just a consequence of massive hours of trial and error as a child.  I'm sure that as an adult I would have never discovered all the STUFF hidden in this game.  I'm not sure whether that's a good or bad thing.

See my blog post.