The Microvision has usually gotten a bad rap in the gaming world, yet, considering the games usually weighed in (or not) at only 1K, they did a pretty good job with what they had at the time.
And now, forwarding to the present with games that take up many megs, have save states for games that could literally go on for years, have realistic shading, polygon graphics (rather than the square block "graphics" of the Microvision), voice synthesis, etc., etc., etc., they usually also come with 148 page manuals that take you forever just to get INTO the (*#! game.
Obviously, that isn't the way with the Microvision, especially as far as Block Buster is concerned.
Block Buster is a version of Breakout, and there's not really much to go on from there: you knock out the blocks, if your ball (or "square", as it is on here, I guess) hits the top row, it speeds the hell up, etc. There's a few settings you can chose from, like using a smaller paddle (which is more difficult, obviously, and harder to control the "ball") and all, but it's still basically a fun game. Your paddle responds well to your control dial, the graphics are...well, blocks, and the sounds are ok. You just pop it in and start playing, basically, there's not much more to it than that.
After all, a game of Starflight for the Sega Genesis (with it's instruction book of over 130 pages) can take weeks, if not months (if you don't go straight for all the items, that is), yet at times I like to hook up my Atari 2600 and play a few simple games of Super Breakout.
You pretty much get the best of both worlds, there. :)