Interdimensional Portals in this game are used in Waves 12, 24, 49, and 67. In Waves 24 and 67, they are capable of moving around, while in Waves 12 and 49, they are stationary. In Wave 12, they summon Chickens and Chicks. In Wave 24, they summon UFO Chicks along with Chickens and Chicks. In Wave 49, they summon Chicks, then Chickens, then Pilot Chickens and finally Eggs. in Wave 67, they only summon Eggs. They are invulnerable to any kinds of weapons, even Missiles, and they give no points once they poof.
Ion Blaster Gift • Neutron Gun Gift • Laser Cannon Gift • Vulcan Chaingun Gift • Lightning Fryer Gift • Plasma Rifle Gift • Utensil Poker Gift • Boron Railgun Gift • Photon Swarm Gift • Positron Stream Gift • Hypergun Gift • Riddler Gift • Corn Shotgun Gift • Atomic Powerup