Knack is a mysterious creature with unique abilities. He is able to transform himself into both large and small forms through the use of ancient relics dependent on the situation and action warranted. While in his smaller form, Knack is able to more effectively traverse small, restricted areas, crawling through ducts, tunnels, and cracks in order to progress. In his larger form, Knack is more formidable than before, able to move large objects, deal with larger enemies, and perform melee combos. He can also absorb the energy of sunstones to perform various energy-melee attacks.