Caged coin

A caged coin is an object in Dr. Mario World. Introduced in World 4, they are purple coins with the image of a virus imprinted on it and may be covered in cages.

Caged coins are coins that are locked inside cages, and it requires the purple coins that are not inside cages to be collected before they are unlocked. The purple coins that are not inside cages can be collected through making a capsule match near it or by eliminating it through skill or items. In most cases, caged coins are unlocked in batches and thus, there is a sequence in which caged coins are unlocked, meaning that collecting every available coin will only release some of the coins. The order in which caged coins are unlocked depends on the stage. Even though a caged coin may be listed in the stage preview, it does not necessarily mean that there are caged coins, as in some cases all the purple coins are unlocked.

Coins that are caged cannot be eliminated, meaning that for skills that target randomly or the lowest lines, it will be ignored unless the coins themselves are contained inside objects such as Brick Blocks. Dr. Petey Piranha's skill is the only automatic skill that will not ignore caged coins, even though they cannot be collected. Dr. Baby Wario's skill can also collect any purple coins that are not caged regardless of its state, but it cannot collect caged coins.

In-game description

 * "Caged coins can't be collected until you collect the coin that unlocks the cage."