When Putting Any Non Sonic Games Into To Double Lot Cartridge On Top, You'll Get A Message Saying No Way. However If You Press & Hold A, B C Buttons It'll Take You To A Secret Menu.

By Pressing On The A Button You'll See The Star Balls Chance Color, Being Blue For Sonic & Red For Knuckles Being To 2 Characters You Can Play As.

When You Beat A Level You'll Get A Gem, As Well As See Some Familiar Game Characters, Afterwards You'll See A Code At The Bottom Of Your Screen Each Time You Win.