Board the ship, then hold "B" and press "A" fifty-five times. Surprise! Solve the sliding-block puzzle to garner a 100 GP reward. In addition, the long bridge on the top floor of the Floating Castle harbors WarMech, the most powerful enemy in the game. You have a 1 in 64 chance of meeting him each battle, so keep fighting.
Final Fantasy introduced many revolutionary concepts to the console RPG genre. The turn-based battles, with their party of heroes on the right and villains on the left, are as frequently imitated as Mario's running and jumping antics. The game's characters are drawn from the mythological archetypes of several cultures. Later games would evolve and refine the battle system, but the magic system would be jettisoned entirely. Instead of a common pool of Magic Points, in Final Fantasy one has eight "levels" of spells and from one to eight uses per "level."
Final Fantasy was released in the US after Final Fantasy III had been released in Japan. Localized and published by Nintendo, the game actually sold more copies in the US than the original had in Japan! Sadly for fans, not even this success would bring the sequels to the States. This landmark title practically created the console RPG genre single-handedly. Its historical influence cannot be overstated.
Now show me Final Fantasy II