Getting the heart in the middle of the Rockies is the tricky part.
Get all 4 outer hearts in the Rockies' area and carefully get the middle one. Just avoid getting yourself sandwiched.
If the Rockies are going in a clockwise motion you're fine. If not, stand on G1 to get them to charge up the G-column and force the movement.
When the Rockies are walking up the G column, wait on I3.5. When one stops on G4, move it to B1 and get the heart. Do a similar process with the other, only moving it to B11 and getting that heart.
Stand on C6 and wait for both Rockies to stop and face you. Step right and when they are entering the A-column to shield you, get the last heart. Get the chest.
