How do you 'run' an Apple ][e floppy disk game?

The

line is a boot failure; it could be the disk has lost some bits over the years, the disk drive (head) needs cleaning, or just as likely, some of the memory in the IIe may have failed. You wouldn't likely expect to get a catalog (file listing) of a commercial game, but CATALOG (for DOS) or CAT (for ProDOS) would work on non-copy-protected disks. RUN A1 would run a BASIC program named A1; BRUN A1 (for DOS) or -A1 (for ProDOS) would run a machine language program.

This is a decent listing of commands for use once you get your machine into working shape:

http://myoldmac.net/FAQ/AppleDOS3.3Commands.htm

Dave Schmenk has done a lot of work in fitting a Raspberry Pi into a card-slot of a running Apple II - as well as connecting to it via a serial port. It essentially runs the GSport IIgs emulator and uses the rest of the real Apple II computer as peripherals. You can see his blog about that here:

http://schmenk.is-a-geek.com/wordpress/?cat=10

Just curious, didn't most games boot the computer directly into the game? Was there a menu that has to load first? You may have a disk that has not survived well.