

(the first batman game)
Sorry to nitpick but there were several Batman games before that. The first one that I know of was Batman (1986), an isometric exploration game on 8-bit micros. It’s a very good game for its time and the engine later evolved into Head Over Heels (1987) which uses a different theme.
The most important thing is to just recording the data. The exact formatting doesn’t matter too much as long as it’s consistent. That way you can always massage it to whatever you come up with later.