In case it’s of any interest as an idea, my regular GM recently devised a played-via-Zoom one-shot after one of our group had needed to bail on a session, and ran it as a real-time puzzle.
It was a sci-fi setting, and we awoke on a space ship which turned out to be approaching too closely to a planet, and destined to reach the point of no return in two hours, dooming everyone. We had exactly that much real time to figure out who we were, what was going on, and how to avoid that fate.
Our GM sent various documents to us which we weren’t allowed to look at unless instructed, but if certain things happened these would provide new information. For example after waking from cryo-sleep, our memories came back after a pre-determined duration, at which point we were told to read a particular document to learn who we were. Finding an information terminal allowed us to see schematics of the ship. Etc, etc…
Time-consuming actions were deemed to take some appropriate N minutes, and the GM would simply attend to other players for that amount of time, while someone was so occupied. 4-5 people might be a lot to manage in real-time, though.
Our session went about as perfectly as possible, as we succeeded in the literal final minute of game time!