Simplify the following text for a Grade 6 native English-speaking person.
Original: The Ace Attorney series , featuring 15 games , began as trilogy of Game Boy Advance titles , called Gyakuten Saiban , released only in Japan from 2001 to 2004 .
Simplified: Ace Attorney , known as Gyakuten Saiban in Japan , is a video game series made by Capcom . It 's mostly found on the Game Boy Advance and Nintendo DS .