Rule GM18 states “Human player containers must be stacked facing down.” The lids on the containers have a lip going around the edges, so therfore could you place the upper containers on top of this lip to raise it into the next Multiplyer zone?
From the wording of the rule, it seems like this would be acceptable.
It may be a good question to ask a referee once you are at the competition, as your robot’s design will probably not revolve around this.
GM18: Human player containers must be “stacked” bottom side facing down.
If you add the “bottom” like it says in the manual the question seems a little easier to answer.