What does "Really?!" mean in English for Spanish?

In English for Spanish, "Really?!" means:

¡¿De verdad?!

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

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

• English for Spanish 3, Level 1, Scene 5
• English for Spanish 3, Level 1, Scene 9