Cedric and the Revolution is an entertaining graphic adventure, using the Adventure Game Studio engine in which you play a character in a Medieval kingdom attempting (and failing) to rouse the masses to protest at the excessive level of taxation by the King.
It's cheerfully off-kilter, in a Luscasarts mold, albeit there are some fairly silly puzzles (crabs crush coffee beans, but hammers do not, apparently). But there's a walkthrough should you find yourself at an impasse. No spoken dialog, no sound effects, and pixellated 320x240 graphics, but not bad at all, really.
Semi-revolution
This Really is a great game, but in the end the only thing that is wrong is not the government, so this isn't quite a message for revolution, in a political sense.