Nintendo's 1990 title Star Tropics for the NES played in a style similar to the original Legend of Zelda. However, the weapons (yo-yo, baseball bat, etc.) make it seem more like Earthbound. The most unique aspect of the game was a piece of parchment that was included with the manual. It contained a letter from one character to the main character, Mike Jones. The game actually instructed players to dip the paper in water, which revealed the hidden number "747," which was required to advance in the game. This, obviously, posed a problem for anyone who bought the cartridge second hand.