Original is by Sanritsu. There are 3 bootlegs-first is by Leisure & Allied that seems the same except in full color, but Space War Part 3 is missing the music when you die, get a bonus life, etc. and Space Wipeout is missing the name entry after you beat the 1st wave of aliens, plus it froze when the aliens got down to the bottom and I had to reset. Also, some of these don't have correct bonus life dips, giving you extra life at 2,000 when it's set to 1,000, etc. Maybe these need looking at more closely.