I use a great program called CD-Boot by Stefan Ossowski 8-) His details are listed right at the bottom of
this page.
Basically, it puts an additional Startup-Sequence into your Workbench telling your A1200 or A4000 to look for a bootable CD as it starts. If one is found you will given the option of booting into the CD32 disc to play the game, or to continue into Workbench :pint: