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The SG-1000 is Sega's first attempt at a video game console. Because it failed in all aspects, Sega dropped it fast and moved on to make the more successful Mark-III, and because of this it's game library is relatively small. The main problem with the SG-1000 was it's controller: it was clunky and unresponsive, and replacing it was a huge headache, since it was hardwired into the console.
This one is so obscure, the only country outside of Japan that received it was New Zealand. It has some variants, like the Othello Multivision.
Tank shmup, you go around and blow stuff while making your way through the terrain. Some stages have cores which you must take down before proceeding.
Nice little Game of Death style Beat'em Up, where you wander around a dark tower and kick the crap out of many badguys. It's similar to Irem's Kung-Fu, but less linear.
Good arcade conversion, in this game you control four ships at the same time to take down those stinking aliens!