Castle/Strategies

Strategy One
One strategy that is used to beat Castle on Hard is to start with a Ninja Monkey in the top-right section of the map. Upgrade it to 1-0 and purchase another Ninja Monkey As soon as possible. After that, invest in Banana Farms, a couple Monkey Aces, Corrosive Glue Gunners and Monkey Apprentices. The mid-late levels (35-40) should always involve builds that start building Villages and Super Monkeys.

Strategy Two
You'll notice that this is the only track, along with Death Valley, in all of BTD with two distinct paths that never cross and that start and end ''seperately. ''So, your strategy will be a little different. A strategy that works on Bloon Circles might do well here, but your best option is probably to start out with Dart Monkeys on each of the first loops with only a couple of upgrades, and then don't buy anything for a very long time. Then, when the bloons start really coming down, sell them and buy good towers, because you'll be able to really upgrade those. That way, you don't have to risk getting things wrong. On this track, one Road Spike tower placed a mere millimeter to the right may be the difference between life and death. Putting a Spike Factory at the end of the track and the start is also a good idea, as this will help your towers.

You may be inclined to put a powerful tower or a fast one, like a Bomb Tower or a Ninja Monkey right in-between the two paths at the very starting edge. DO NOT DO IT!!! It'll only take at very best around 6 rounds before the bloons escape the tower and your lives start dropping, and then you're in very big trouble (only a Super Monkey has at least a small chance). If you really like putting towers at the beginning, then do a "Monkey Triangle": Put a dart monkey in each of the first loop, and then one at the start, or save up and put a Boomerang Thrower or a Bomb Tower there. But never, ever, rely on one and only one, tower. You'll certainly pay the price, especially if you've invested a lot of time and Monkey Money and/or Special Agents into Castle.