If you're playing Kingdom Hearts and can't beat Cerberus, you've come to the right place! We will help you defeat this enemy in no time!
Steps

Step 1. Stock up on healing items
Make sure you have enough healing potions and other needed items. If you have powerful potions like Hi-Potions or Mega-Potions, you will need them more.

Step 2. Prepare for battle
Set Donald and Goofy's challenge to "Only in an Emergency" so they don't appear constantly idle. They will just get in your way and use your healing potions.

Step 3. Save before the battle
There is a save space in the Colossus lobby. In the event that you lose, it will be easier for you to start over. You will appear in the place where you signed up!

Step 4. Enter the arena
After you select the dialogue option “I’m not afraid”, you will enter the arena, the cutscene will start. The battle starts right after the cutscene, so get ready!

Step 5. Concentrate on one of the Cerberus heads
On the left or right, but not on the middle. When he throws energy balls at you - dodge, rolling to the side. When he begins to growl into the sky, it means that he will now attack with his teeth. Attack him immediately! Walk up to him and attack one of his side heads. Attack once, then quickly move away, if you do not move away in time, Cerebrus will attack you with a very powerful blow.

Step 6. Dodge Cerberus attacks
You cannot constantly attack Cerberus. You need to attack, then back away, deflect from his attacks, roll back or jump back, and then attack him again. If you constantly attack, you will not succeed.

Step 7. Use potions and other items to restore health
When your health starts flashing red, run away, use a healing potion. Don't use healing potions on Donald or Goofy characters, they have their own. Besides, they won't be killed anyway.

Step 8. Attack the last head of Cerberus
After you disable Cerberus' side heads, it's time to attack the middle head. Dodge his attacks. Kill Cerberus by disabling his last head.