Cash Drop

Cash Drops is a Power in BTD6 that gives $2500 in-game cash for one game. They cost 200 to purchase (or 180 if when the "Budget Cash Drops" Monkey Knowledge unlocked and enabled). Note that the money provided in Half Cash is only $1250, as all forms of income are halved.

Summary
An instant source of income. It is a popular source of gaining a boost in cash whenever needed. In order to make the most use of it, use it during the early-game and use that money for buying early-game income sources as well as buying Heroes as soon as possible. Income sources such as Benjamin or lower-tier Banana Farms placed during the early-game can actually extrapolate income very quickly if used in the early-game, which provides the maximum value from each Cash Drop. Benjamin is a special case, which actually benefits doubly from this.

Tips

 * Try to use Cash Drops sparingly as they are rather expensive.
 * Cash Drops provide a powerful early game lead and can easily be used to build up defenses if there are weaknesses to certain bloons.
 * Notably, this power is often used in Co-Op Mode due to the slow distribution of cash given so it can help boost a single player to buying more defense. A "No Cash Drops" co-op emote is available in the Trophy Store.
 * Beware that some players get ticked off by unauthorized Cash Drops in Co-Op more than any other Power besides expensive Insta-Monkeys and will leave the game as a result.
 * Cash Drops can be also be collected via Monkey Farmers. It is worth having one nearby so that the cash collection is near-immediate.
 * Not collecting the Cash Drop will not lose the money, however, but autocollect for the full amount.

Trivia

 * In the initial release of the game, Cash Drops that were left alone would expire after approximately 15 seconds and then provide roughly $625,000,000 in-game cash. This bug/exploit has since been patched and the reason for occurring is unknown, but most likely is caused by a duplicate multiplication of "2500".
 * Cash Drops replaced Cash Injection in BTD5 and BTD4.
 * When using a Cash Drop, a Cash Drop will drop from a parachute, accompanied by the humming of a non-visible Monkey Ace.
 * In a blog post, Ninja Kiwi revealed that the Cash Drop is the most-used power in the game by far (especially since BTD6's Co-Op players commonly consume Cash Drops on Co-Op Mode), with over 90 million total uses, compared to the ~40 million of Road Spikes.