How do I finish the game?

Hint 1 of 6:

You have the blue stone.

Hint 2 of 6:

Wave it.

Hint 3 of 6:

A 50-franc note.

Hint 4 of 6:

Go to the Unreal City.

Hint 5 of 6:

Buy a map (the french word for map is Carte).

Hint 6 of 6:

Take the ship home.