AllgamesRetro

Is it worth anything or no?

I was wondering if anyone could please help me out. I was cleaning out my Dad's basement the other day and came across this atari 400 cartridge. Mr. Do!'s Castle I have done some research on it and i know it was never suppose to be released but it was released in Canada for awhile. This is not that cartridge though I am wondering if anyone has ever seen this before Any input would be greatly appreciated