Dragon Warrior 4, NES. Used and played dozens of times as a kid. Recently cleaned out a shoebox of games that have been sitting in there for over 20 years. Worked perfectly fine before it went into the shoebox and have no reason to believe it wouldn't play now (also NES games are basically indestructible), but I don't have an NES to test on. I can offer refunds if it's broken, but it's priced as if it is not. I have no concerns it will not work.

(If I did I it wouldn't be listed here.)

Comes with heavily used hint book and 2/3s of enemy and armor sheet (it's all in the hint book.)