Banana Research Facility

The Banana Research Facility (BRF) is the fourth and final upgrade to the Banana Farm in Bloons TD 4, giving 2000 money every round. It costs 10000 money on Medium Difficulty. It appears in Bloons Tower Defense 4 and Bloons TD 5. It is unlocked at Rank 28. this tower is important to get you far in the game as most towers will be near useless in later levels and the ones that make the most difference (Sun God, Laser Cannon, Monkey Wizard, etc.) will be really expensive, making them a big payoff.

Appearance
The Banana Research Facility is the only upgrade of the Banana Farm to have no open space. There is a grey rectangular prism at the bottom of the facility. There is a large light blue window on the prism. Then there are two pipes on top of the right side of the prism. Finally, there is a cube on the left side of the prism, looking exactly like it. The only difference is that there is a banana sign on top of it.

How to Use

 * 1) Use this strategy for medium or hard. You will need to buy the Banana Farm in the early rounds, and then upgrade it to Banana Plantation as quickly as possible. Then after 5 more rounds, you should try to buy Banana Republic. Then when you get to Round 40+, try to buy the BRF. This upgrade should be bought at or before Round 53 on medium, or Round 57 on hard. Let the money roll in!
 * 2) Getting ten of these in BTD4 will make you get $20,000 per turn and will allow you to get tons of Sun Gods.

Trivia

 * In BTD4 iPhone/iPod, this upgrade is called 'BRF'.


 * In BTD5, this upgrade produces boxes of bananas for $200 if you collected ($300 with Valuable Bananas)