Assuming you clear the Extra Stage with a AA grade or higher, you will gain access to the Encore Extra Stage. You can only choose one song, Chaos, and it will immediately end if you get anything other than a Perfect or Great. Clearing Chaos with a full combo allows you to purchase it in the shop as well.
Assuming you clear the Extra Stage with a AA grade or higher, you will gain access to the Encore Extra Stage. You can only choose one song, Chaos, and it will immediately end if you get anything other than a Perfect or Great. Clearing Chaos with a full combo allows you to purchase it in the shop as well.