Thank you both for the suggestion. I switched off 32-bit addressing in the Memory Control Panel and rebooted into System 7.1 and found a Battle Chess now launches just fine.

Now if I could just get LoadRunner 1.0 to stop crashing every now and then, my kids will be all set!

It never ceases to amaze me how fun these old games are even after all these years, especially the Dark Castle series.

Thanks.