@XDFreakLP(View Post) If I remember correctly the reason the walls all had to be 4 thick was due to air/pressure being calculated on a 4x4 grid, meaning only 4x4 walls could block pressure.
@XDFreakLP(View Post) ttan blocks pressure in any thickness, but 2 pixels after the last pixel of ttan seems to have pressure and after that the pressure gets blocked. weird. and ttan stops blocking pressure when sparked.