Stamp #029 is obtained by playing Roulette in Sandpolis. Roulette can be played in a tall golden building. You do not have to win to earn the stamp. As the minimum bet is 10 currency units, you must have at least that much money to obtain this stamp. This is one of the easiest stamps to get along with Stamp 4, Stamp 54 and others because once you find the roulette building (most players have over 10 currency units) earning the stamp is as simple as playing roulette and leaving the building.