What does "the third floor" mean in English for Spanish?

In English for Spanish, "the third floor" means:

el tercer piso

Listen to "the third floor": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 4, Level 1, Scene 4
• English for Spanish 4, Level 1, Scene 6