ARTT is one of Doctor Robotnik's most powerful creations. "ARTT" stands for "Artificial Robot Thought Technology". ARTT was developed for the purpose of defeating the Sonic Underground and their Freedom Fighter allies. Able to absorb any technology into his frame to increase in size and power, ARTT is a learning robot, capable of adapting to anything his opponents might deploy. ARTT was destroyed after he turned against Dr. Robotnik.