Midway through the game, the player becomes stuck on an island, and the only way to coninue on is by entering a three digit code into the Sub-C's computer. However, in order to access the code, the player was required to lightly wetten a specific page in the game's instruction manual, revealing it. Naturally, if the instruction manual had been lost, damaged or otherwise rendered unusable, then the only way to continue was through frustrating experimentation until the proper code was input: 747.