Ninja Kiwi's "Bloons Tower Defense 5" is a free online game that utilizes elements of strategy and resource management in order to clear each stage. The game revolves around the placement of towers on a track in order to pop oncoming balloons and earn rewards.
"Bloons Tower Defense 5" is the fifth game in developer Ninja Kiwi's "Bloons Tower Defense" series. Unlike other entries in the series, the game features multiple play modes and gives players the ability to create an account to save progress throughout the game. In addition to the standard tower defense levels, the game also features daily challenges that reward players with in-game currency that's used to upgrade towers within different levels or to purchase Special Agents. These Special Agents provide added bonuses and abilities not available to standard towers.
The game is built on the free-to-play model, which means there is no direct upfront cost to play the game or access items, as it is possible to earn in-game currency for free through regularly playing the game and participating in special activities. The game also includes the option for players to use real money to purchase in-game currency. The free options allow for earning currency at a slow rate, which is meant to encourage players to buy the currency outright instead.