Start by going past the checkpoints and jumping over the gaps. Stop when the guard tells you and mimic his whistling noises. Doing so correctly lets you pass. Go down and you’ll be prompted to chant. Use it to possess one slig and kill the other. Then go through the door. Go through the door and down to the pulley. Pull yourself up and you'll meet another guard so mimic him to pass.
Go pull the lever and into the chute. Mimic the next guard and go into the other door. Go through the chute and chant to open the portal. Pull yourself down and go left. When the bees attack, run to the nearby Mudokon to have them sting him instead of you. Then climb up and get the bell song. Go back to the pulley and go up to chant near the bells and open the door. Go to the right and mimic the guard and use the lever to light the lock and go through. Jump down and go to the left door. Run to the far right and use the lever and head to one of the next level.