Simplify the following text for a Grade 6 native English-speaking person.
Original: Initially , Darth Vader appeared on the PlayStation 3 , and Yoda appeared on the Xbox 360 ; Namco later made both characters downloadable content on the opposite platform for a fee . Darth Vader 's Secret Apprentice , the main protagonist of LucasArts ' video game Star Wars : The Force Unleashed , is playable on both the PlayStation 3 and Xbox 360 versions .
Simplified: The PlayStation 3 version has Darth Vader , while the Xbox 360 version has Yoda .