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From Sonic Retro

Official artwork of Mecha Sea Lion

The Mecha Sea Lion is the boss of Aqua Lake Zone, the third level in Sonic the Hedgehog 2 (8-bit). This mechanical sea lion attacks Sonic by means of an inflatable, explosive ball. Sonic must hit the ball as the robotic sea lion is still in the process of blowing it up, in order to do any damage. Other attacks will be repulsed, as the machine simply bounces Sonic atop its robotic nose, before tossing him to the side of the screen.

Sonic the Hedgehog 2 (8-bit)

Sonic 2 (8-bit) Main Article Levels Enemies Bosses Cheat Codes Game Development Game Secrets Magazine Articles Music (Game Gear) Level Maps SCHG

Levels: Underground Sky High Aqua Lake Crystal Egg Green Hills Gimmick Mt. Scrambled Egg Enemies and Obstacles: Bomb Buton Drillin Game-game Meleon New Motora Taraban Zaririn CE Badnik Bosses: Doodlebug Mecha (UZ) Goose Mecha (SHZ) Mecha Sea Lion (ALZ) Robotnik (CEZ) Mecha Pig (GHZ) Inobuta Mecha (GMZ) Mecha Sonic (SEZ) Cheat Codes: Zone Select: As the game loads, hold all the regular buttons and (Master System) or (Game Gear) until you hear two ring notes. For a list of all codes, see Cheat Codes:Sonic the Hedgehog 2 (8-bit).