If the player has been attacked, they can defend against the attack by clicking the 'Monkey V Monkey' button, and then clicking on the attack in the 'Pending Attack' section.

If the attack is successful, the player who sent it will get a reward. After the strength and highest bloon type is selected, the player must click 'Go!' and the attack will be sent. The higher the strength and bloon type are, the more Bloontonium is required, and may even requireBloonstones. Once chosen, the player will be able to choose the strength of their attack and which bloon will be the strongest bloon. To start an attack, the player must click the 'Monkey V Monkey' button, and then choose if they want to quickly attack a random person or attack one of their friends. Once all three buildings have been built and some Bloontonium has been generated by the Bloontonium Generator, the player can attack other players.

To attack other people, the player must build a Bloontonium Generator, a Bloontonium Storage Tank, and a Bloon Inflation and Deployment Facility. Once the player's city reaches level 9, they can attack other players and be attacked by other players. Most tiles will restrict a player from using one or two towers, such as water tiles, where one can not use Ninja Monkey towers or Bomb Shooter towers (Excluding the special mission 'Shipwreck' or 'Sub Alliance' in Mobile) Some tracks on certain tiles are notably more difficult than others, and thus those tiles will have a slightly higher difficulty rating than tiles near it. The difficulty of each piece of land relative to the player's level and choice of buildings can be inferred from the number of dots, ranging from one coloured in dot (trivial) to five coloured in dots (very hard) or five dark colored dots (impoppable). However, there are also tiles with multiple bloons shown, suggesting higher ranked bloons than what is actually shown. When hovering the cursor over a new piece of land, the highest ranked bloon will be shown. However, the further the player strays from their initial city centre, the difficulty of the level increases, such as more rounds with stronger bloons. To expand the city, the player must attack and capture more pieces of land. When a player first starts Bloons Monkey City, they will start off with 2 Dart Monkeys, however, more towers can be gained by purchasing the tower's specific building and placing it on a tile that has been captured, you also unlock upgrades different to most bloons games, to unlock upgrades you must research them in upgrade buildings for City Cash, although some require special buildings such as the Centre Of Camo Countermeasures.

To capture a tile, the player must defend against waves of bloons using towers and survive with at least one life remaining. The objective of the game is to build and expand a city by capturing tiles. There are lots of things you can do from building to attacking other people. Bloons Monkey City is a city-building simulation game where players can build their city by capturing land and constructing buildings.

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