Which Portal!?

1   Send Me Back In
2   Let Me Out
3   Perpetrator Trap
4   Butterfly Effect II
5   Initiate Launch Sequence
6   Which Portal!?
7   Bug Zapper
8   Reconcile
9   Scale Back the Dragon
10   Can of Worms
11   Final Boss
12   Still Breathing (Side B)
13   War of Worlds
14   Golden Spiral