For this challenge you must complete the arcade mode on default dip switch settings. Thankfully you can still use continues, change the difficulty and even switch characters if you feel the need. Jumping heavy kicks (R2) paired with sweeping heavy kicks tend to work for the most part however the AI will occasionally catch on to this. The end boss Gil is a royal pain, however he's definitely manageable. Spam projectiles if you feel the need (Quarter Circle Toward + Punch with Ryu/Ken), don't forget to utilize the super of your choosing as they can save you in a real pinch.