Select to play as Sonic and Tails and enable the 'Level select', 'Super Sonic', and 'Debug mode' codes and enter any stage. Get 50 rings and turn into Super Sonic. Change Sonic into the television monitor. Change Sonic back and have him jump to turn into Super Sonic. Jump on the television monitor to have Tails become invincible. Then, turn into an enemy and put it right on tails while he is invincible. Continuously place the enemy there and since Tails is locked in the sonic spin move and he will destroy them. As Tails destroys the enemies in this position keep pressing C (don't let go of Down on the D-pad) until the score for destroying an enemy increases from 100 to 8,000 to a 1up. When you have enough 1ups, press B again to revert to Sonic.
Added by: Sanzano Apr 26th 2011, ID#3842