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Incompatible stones will glow red when equipped to a chassis, and will cancel each other out unless one or the other is removed. Certain Bunyip Stones also cancel each other out (mostly the elemental stones, and warp stones, which are incompatible with most other stones). With each boomerang chassis having a limited number of Bunyip Stone slots, the player is forced to strategize which stones they should make use of and which boomerang chassis to equip them to. Bunyip Stones can also be given as rewards for completing the game's various side-quests.
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However, new boomerang chassis and Bunyip Stones can be purchased using Opals, the game's currency, from various stores spread across Southern Rivers. At first, Ty has only one boomerang chassis, and no Bunyip Stones whatsoever.
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The stones can be mixed and matched to make unique boomerang combinations, (such as explosive Lasorangs or Multirangs that track enemies). These stones can be equipped to various boomerang chassis to change their functionality or elemental properties. The overall gameplay remains similar to the game's predecessors, with the game's introduction of Bunyip Stones being a new addition to the series.
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