Drill Eggman II (ドリルエッグマンII Doriruegguman II?) is the sixth boss that the player encounters in Sonic the Hedgehog 2. It will pop out the rocky ceiling at Mystic Cave Zone Act 2 and it is piloted by Dr. Robotnik. The player has to hit the Eggman Mobile eight times to defeat this boss. Drill Eggman II is mostly an upgraded Eggman Mobile with two drills (colored yellow with red stripes) and a rocket under it. In the 2013 mobile re-release of Sonic the Hedgehog 2, it is possible to skip this boss in regular gameplay if the player instead falls into Hidden Palace Zone.