You must find all six well-hidden Chaos Emeralds in the acts to rescue Tails.

Unlike the 16-bit version where Tails is your active sidekick, the handheld edition focuses on a solo rescue mission. Sonic returns home from his previous adventures to find that the mad scientist Dr. Robotnik has kidnapped his new best friend, Miles "Tails" Prower.

Missing even one emerald results in a darker credits scene where Sonic fails to save Tails. 🕹️ Exclusive Gameplay Features Sonic The Hedgehog 2 (Game Gear) - Sega-16