The default bricks, but with code in them so it's just impossible to shoot a projectile at them. You just can't even try. It doesn't shoot. They could be modified from the anti-portal bricks, right?
USES:
Safehouses or neutral territory in TDMs
Rocket spam shields around a build
LOZ builds with the hookshot so you have to hookshot the specific grates
Creeper that's immune to the rays
Peaceful, war-less zones in City RPGs
