"We also considered a few additional game features, such as gates that would trap the ghosts, but these also had to be sacrificed in order for us to finish on t

"We also considered a few additional game features, such as gates that would trap the ghosts, but these also had to be sacrificed in order for us to finish on time." I recall that Lock 'n' Chase https://en.wikipedia.org/wiki/Lock_%27n%27_Chase https://en.wikipedia.org/wiki/Lock_%27n%27_Chase (1981) had gates to block the baddies. I wonder what the earliest example of blocking gates in a maze game like this would be...