After Skull Kid transforms Link into a Deku Scrub, the Happy Mask Salesman teaches Link the Song of Healing and transforms the Deku Scrub's spirit into the Deku Mask. The Deku Mask is very helpful and required to complete the Woodfall Temple. While wearing the Deku Mask, Link uses the Deku Pipes instead of the Ocarina of Time.
When Link wears the Deku Mask, he transforms into a Deku Scrub. In this form, Link can skip across water three times before falling in. The Spin Attack replaces Link's Sword, which is much faster than normal walking. Deku Link can also shoot a bubble from the his snout, but it uses up Magic Power from his Magic Meter. Link can hold it at full charge, but it still depletes Magic Power once he lets go. Deku Link also has the ability to enter Deku Flowers and then jump out of them, launching high into the air. Link can then temporarily fly using leaves as propellers. While flying, Deku Link can drop Deku Nuts on to enemies below.