Had them as a kid. A canvas in beige that spanned my whole view and was the entire world. There was an invisible opponent and we played a game. You filled half

Had them as a kid. A canvas in beige that spanned my whole view and was the entire world. There was an invisible opponent and we played a game. You filled half of the seemingly infinite canvas with black or a dark blue. Then the other person until no beige remained. I always lost.