Battle Chess 4000 by Interplay required the manual to be played, as it would ask challenge questions before it would let you play the game. The manual had about

Battle Chess 4000 by Interplay required the manual to be played, as it would ask challenge questions before it would let you play the game. The manual had about a dozen different games laid out, and a challenge question might be phrased like "On game 8, where is the white rook?" and you'd have to answer in chess notation like "D3". I had lost the manual and Interplay sent me a new one after I had cut out the UPC code and mailed it to them for proof of purchase, which was awfully nice of them. Years later, after losing the spare manual, I got prompted with this question, and after a couple dozen tries just for fun, I blindly and correctly guessed the location of a specific piece on a specific board. I'm not sure what the probability of that would be(probably smaller than 1/64) but I felt like I could've played and won the lottery that day :)