R-Type1. Some people believ this is the best arcade flight simulator. 
I think, that UN Squadron is muct better, but there're many options. So, you
MUST have R-Type in your collection. This 128K version doesn't have
normal 8th level, but the cheat mode is dimply perfect. (c)1989 Irem 
Corporation, (c)1995 Silicon Brains, Nicolaev, RF.