You may need to do the level select cheat with Sonic and Tails before this hint.
You need to go to the last level and first beat the finger smasher part of the boss.
Then hit Robotnic on the head,after that he should shoot a hyper beam at you.
Before he does the hyper beam get second player to control Tails and fly Sonic while he shoots the hyper beam.
Keep repeating this and you will beat him.
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