Gizmo

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Gizmos are interactive elements on maps in Bloons TD 6. Their location and function varies. Many of them cost cash to activate, similar to removables, and are not affected by the difficulty. Gizmos that cost cash are similarly affected by the Removable Cost Rate challenge rule, and setting it to "disabled" also disables gizmos that do not cost cash.

List of maps with gizmos

Polyphemus

The "eye" in the center of Polyphemus costs cash to open, and provides buffs to towers placed in it. It closes after every round number ending in a 5, requiring progressively more cash to be spent to open it.

Ancient Portal

Ancient Portal contains a "Realign Portal" gizmo which toggles which of the two portals Bloons are sent to. It is currently the only gizmo which is always free to activate.

Castle Revenge

Castle Revenge has a "Pressure Valve" near the end which costs cash to activate. When activated, it blows back nearby Bloons.

Dark Dungeons

Dark Dungeons has a statue which may be activated, summoning a spirit to pop Bloons around the map. The spirit may be upgraded with further cash investments.

Workshop

Workshop has two gizmos: One which enables track extensions to force Bloons to take a longer path, and one to slow down Bloons. Both gizmos start out free but increase in cost each time they are used.