The theme of the jam is The Dunning-Kruger Effect.
The protagonist must be the smartest person in the game, but everyone including themselves believes they are the dumbest person.
For example, they could be a scientist who everyone considers to be incompetent, but is actually a genius, or the least moronic of a group of morons, etc.
The intelligence discrepancy must be the main driver of the plot and source of conflict, instrumental to the story and the goals of the protagonist, not just something that happens in one part. The character must truly believe themselves to be the dumbest person present, not just pretending to be. It could be revealed at the end that they are smart, but doesn't have to be and cannot be revealed before the end.
Have fun with the jam!