How to get the game:
Register on Steam or log in with already existing account and enter on Sonic The Hedgehog 2 store page. Click on Add to Account button to keep this game permanently. This offer will expire Oct 19 at 17:00 UTC.
Or just click on following link: https://store.steampowered.com/app/71163/Sonic_The_Hedgehog_2
About this game
Dr. Eggman (aka Dr. Robotnik) has returned, turning helpless animals into robots and forcing them to build his ultimate weapon, the Death Egg!
But this time, Sonic has a friend that can help him: Tails! Find the 7 Chaos Emeralds and stop Dr. Robotnik’s evil scheme!