Description: Sonic the Hedgehog is once again put in a difficult situation. In this part of the game called the Stone of Chaos, Sonic has the ability to become invincible when battling the enemy, as he uses the power given by this stone to his advantage. The battle is lead on two fronts; while Sonic is taking care of a really big and mean looking enemy, two of Sonic's friends are trying to defeat X, who decides to suddenly disappear when he feels the battle is going to be lost.