Speaking with XBLA Fans on the E3 show floor today, Microsoft revealed that forthcoming Dust: An Elysian Tail will contain an arena-type gameplay mode and difficulty setting for casual gamers. Challenge Mode is designed to keep gamers coming back for more after they’ve cleared the campaign of the Summer of Arcade release.

The casual difficulty is pretty self-explanatory, but the manner in which it was play-tested is a bit unusual. Humble Hearts didn’t lean on a team of seasoned game testers to exhaustively play through every scenario in the game on casual in order to properly hammer out its balance. Instead, the studio stayed inside the family. Dean Dodrill, the sole man slaving away on everything that is Dust besides its music, had his four-year-old daughter play through it. When she was able to beat it with “no issues,” its difficulty curve was deemed just right.