Talk:Prisma Causeway Event/@comment-190.198.241.145-20160909190812/@comment-70.30.3.233-20160909192551

Exactly what the person above me said. However, just so you know for the future:

If you read the text on the greyed-out stage, you'll see it has a number on it. In your case, it should say 'No.24'. That means that in order to unlock the stage to do it again, you have to complete Mission No.24. If you check the translated /Mission List/, you'll see that it says that in order to complete Mission No.24, you have to defeat 20 Biscuit Golems.