Hello.
Apologies if this has been answered before, but...
I've got a Keystone Kapers (Activision) with an extra sticker on the front of the cart.
It's small and looks like a letter S inside a diamond.
I'll upload a photo when I figure out how :-)
Or you can look here:
http://www.atariage.com/forums/viewtopic.php?t=42902
(No solid answer there at time of typing this.)
What's that for?
The cart runs in PAL with some odd colours, if that's any guide.
Cheers!