for the people who dont know how to get all three forms hers a tutorial!
kangaroo form: hop from plate to plate without touching the ground.
wolf form: interact with the wolf stone under the grapes, follow the particles that appear to the the stone that appears, repeat this process two more times.
bat form: when you interact with the three fruits, you will hear a different sound. and when you interact with each of the three bat stones you will hear a different sound as well. interact with the ones with matching sounds until all three stones are lit!
hope this helps.