I think the whole middle section (the 4 smaller icons) are part of the 2nd scenario and you can unlock the "next" part of this scenario by clearing / playing(?) the one before.
This can be seen, by hovering the mouse over the icons. For the ones in the middle a tooltip appears that indicates unlocking after beating the previous battle, but for the last one another tooltip shows a message along the lines of "this scenario will be playable soon".
Currenctly playing through the second battle. Don't know how to help you though. good luck! ^^
bjarnistef
Newcomer
bjarnistef
Newcomer
2 400g2g ptsReport comment
Why do you report bjarnistef?
Are you sure you want to block bjarnistef ?
BlockCancelAre you sure you want to unblock bjarnistef ?
UnblockCancelBoohui
Forgotten Nickname
Boohui
Forgotten Nickname
19 300g2g ptsReport comment
Why do you report Boohui?
Are you sure you want to block Boohui ?
BlockCancelAre you sure you want to unblock Boohui ?
UnblockCancelbjarnistef
Newcomer
bjarnistef
Newcomer
2 400g2g ptsReport comment
Why do you report bjarnistef?
Are you sure you want to block bjarnistef ?
BlockCancelAre you sure you want to unblock bjarnistef ?
UnblockCancel