A pack of eight 'Portal-Proof' bricks that players cannot place Portals on, which can be used to make interesting challenges with the Portal Gun.
- Anti-Portal 1x1
- Anti-Portal 1x4
- Anti-Portal 1x16
- Anti-Portal 1x1f
- Anti-Portal 4x4f
- Anti-Portal 1x4x5
- Anti-Portal 1x12x5
- Anti-Portal 16x16 Base