[math-fun] Homological Dots-and-Boxes

Does anyone besides me remember this game (Andy Latto, maybe)? I never played it, but when I was an undergrad math major at Harvard around 1980 I think I saw some grad students play it. If I recall correctly, a legal move involved adding a new object and a new morphism to an ever-growing commuting diagram, subject to rules about exactness of sequences etc. Jim