How do you unlock the last two arena mission kh bbs?

To unlock the last two arena missions in "Kingdom Hearts: Battle Battle System" (KH BBS), you typically need to complete specific story missions and achieve a certain level of progress in the game. Make sure you've finished the main storyline and met any additional requirements, such as obtaining specific trophies or collectibles. Additionally, check for any updates or events that may affect mission availability. If you’re still having trouble, consulting a guide specific to the game can provide detailed steps.