Submarine Eggman II (サブマリンエッグマンII), also known as Eggmarine, is the seventh boss fought in Sonic the Hedgehog 2, encountered at the end of Oil Ocean Zone.
The boss arena features two large platforms on either side of the screen, with a large pool of oil inbetween. Similar to Hill Top Zone's Submarine Eggman, the fight begins when Dr. Eggman slowly surfaces from beneath the oil in a submarine. The craft will float on the pool's surface for a few seconds, before slowly submerging beneath it once more. While the submarine is on the surface, the player can damage the boss with a Spin Attack.
Once the submarine has submerged, a detached tentacle-like robot arm with a large spiked tip will launch up out of the oil in an arc, jumping over one of the arena's platforms. It will damage the player if touched, but can be avoided simply by jumping over it.
Next, another tentacle-like arm will rise vertically from the oil, this one sporting a laser cannon on its tip. The cannon will turn to target the side of the screen the player is on and fire three shots towards them at varying heights - these can be jumped over or ducked to avoid. If a shot is low enough to skim the tops of the arena's platforms, they will ignite on contact, creating a wave of blue flame the player must jump to avoid. Once three shots have been fired, the arm submerges beneath the oil again and Dr. Eggman's submarine resurfaces, beginning the cycle again.
After eight hits, the submarine will explode and submerge beneath the oil, allowing the player to proceed to the Capsule and complete the Zone.
||Compressed art offset
|Sonic the Hedgehog 2
||Oil Ocean Zone boss
||$882D6 (Nemesis Format, 181 blocks)