Number Blast; Atari 400/800/LX/XE; Disk w/Manual APX-20097 NOS - Paperback
(Paperback cover, Diskette INCLUDED). APX Number Blast by Richard Wiitala. APX-20097 400/800/LE/XE with 810 Disk Drive/ 32K RAM. Here's a one- or two player number drill combining quick thinking with quick reflexes.