The lecturer pre-generated small black & white square bitmaps of single characters from a sample set of fonts to use as aids during development. (Just the lower case letters a to m.) Then your mark was the percentage your OCR could recognise from a much larger set generated from about a thousand fonts.
In the same course the next major project was to make an AI for the card game Hearts. This is a four-player game, and the project materials included an automated tester that could be given any 4 AIs and would score them against each other. In the labs we would battle our AIs while developing them.
I ended up getting the second highest score out of a class of three hundred students and I still don't know how to play that game well. (I got the AI to teach itself the probability tables for optimal play, which I didn't memorise.)