In order to progress through the game, players must collect various items to use. Each player can only hold one item at a time (two in single player). The grappling hook is used to cross large gaps between hooks, though can also be used to knock back enemies and collect items from long distances.
To advance through the game, players must gather various objects for use. Each player can only hold one item at a time (two in single-player mode). The grappling hook is used to cross wide gaps between hooks, but it can also be utilized to knock back enemies and retrieve items from afar.