What is the difference between street fighter alpha 2 and street fighter alpha 2 gold?

Street Fighter Alpha 2 Gold is an enhanced version of Street Fighter Alpha 2, featuring additional characters, new gameplay mechanics, and balance adjustments. Gold includes characters like Evil Ryu and the ability to select different versions of characters, which adds variety to the gameplay. Additionally, the graphics and overall presentation were improved in Gold, making it a more polished experience compared to the original Alpha 2.