To use the Devil Heart in Chainsaw Man: Devil’s Heart on Roblox, start by finding the heart. The heart spawns randomly around the map, so server hop and search for it. It has a 50% chance of appearing every hour.
Next, obtain the Blood Hammer from the contract dude. You will need to use this hammer to reach the roof where the heart spawns. Use the Blood Hammer three times to get to the roof.
Once you are on the roof, use the Blood Hammer again to collect the heart. After collecting it, your next step is to earn 10,000 Yen. You will need this money for the next part.
With 10,000 Yen in hand, run to the hospital and talk to the nurse. She will offer to switch you to Hybrid mode. Accept her offer, and you will become a Hybrid, unlocking the Chainsaw Man powers.
Follow these steps carefully, and you will successfully use the Devil Heart in Chainsaw Man: Devil’s Heart on Roblox. Enjoy your new powers and have fun exploring the game!