Bonus Monkey!

 is an upgrade in the Primary Monkey Knowledge tree. It makes the first Dart Monkey placed per game free, in a similar effect to the Monkey City upgrade. If a free Glue Gunner affected by Bonus Glue Gunner is placed, the provided free Dart Monkey becomes voided. requires 10 primary knowledge points invested, Come On Everybody!, and a one-time purchase of 1000.

Summary
The biggest value out of this MK Point is the lack of a need to pay money for the first Dart Monkey placed. This in turn makes early-game much more easy to manage, especially in game modes that require the need to save money.

Tips

 * This MK is very useful on Half Cash due to how much it saves for the early game.
 * Plan the placement of the Dart Monkey carefully, as selling it will refund no cash.
 * In most cases, the free Dart Monkey can be safely kept around as a starting tower. The only exceptions to this are if the player is trying to utilize the discount portion of the "Come On Everybody!" MK, or on a map where Primary Monkeys are generally subpar.

Trivia

 * "Bonus Monkey!" is possibly a reference to the Bloons Monkey City Monkey Knowledge for the Dart Monkey at Rank 3, 8, 13 that grants a free Dart Monkey per game, with Rank 3 being the closest match to the "Bonus Monkey!" effect.