Sonic 2 Heroes

Sonic the Hedgehog 2 is a side-scrolling platformer where players navigate themed zones, each typically split into two acts. The primary antagonist, Dr. Robotnik, seeks world domination by converting animals into robotic Badniks to construct the Death Egg weapon. The player controls Sonic, who is often accompanied by Miles "Tails" Prower, to thwart this plan by destroying Robotnik's machines at the conclusion of each zone.

Gameplay revolves around speed and collecting rings, which serve a dual purpose. Rings provide protection; if Sonic is hit while holding any, they scatter and he gains brief invulnerability. Being hit without any rings results in a life loss. Accumulating 100 rings grants an extra life. A new maneuver, the spin dash, allows characters to generate speed from a standstill by crouching and repeatedly pressing jump, which is useful for gaining momentum on slopes.

The game includes cooperative and competitive multiplayer elements. A second player can join at any time to control Tails, who has infinite lives and follows Sonic's camera focus. A separate versus mode offers a split-screen race through condensed versions of three single-player zones.

Special Stages, accessed by touching a lamppost with at least 50 rings, task players with collecting a required number of rings in a halfpipe environment to earn one of the seven Chaos Emeralds. The mobile version introduces additional content, including a new Hidden Palace Zone with ten levels, a boss attack mode, enhanced graphics and frame rate, a remastered soundtrack, and Knuckles as a third playable character.