Bloons TD 4
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Bloons TD 4 (also known as Bloons Tower Defense 4 and BTD4) is a title used to refer to multiple games: the Flash version of Bloons TD 4, a 2009 browser game developed by Ninja Kiwi; Bloons TD 4 Expansion, a 2010 standalone game based on the Flash version with specialties and different maps; the mobile version of Bloons TD 4, a 2010 mobile game developed by Digital Goldfish; and the DSi version of Bloons TD 4, a 2012 port of the mobile version for the DSi. It is the successor to Bloons TD 3, introducing a revised upgrade system, Premium Upgrades, new game modes, map difficulty, and Challenges.
Gameplay
Bloons TD 4 follows the same tower defense conventions established in prior games: enemy Bloons enter the map in waves and follow a path to reach the exit, and the player's goal is to spend cash to place towers (also called Monkeys or Monkey Towers) on the map that can attack and pop the Bloons before they leave. The player earns cash from popping Bloons, which can be spent on more towers and upgrades to make them more powerful. Each tower has one path with four upgrades, discontinuing the two-path system from earlier games. Some towers and upgrades don't pop bloons, but instead support the player in some other way, such as the Monkey Beacon increasing the range of nearby towers and the Banana Farm earning money at the end of each round. As the game progresses, more difficult Bloon variants are introduced, for example the Blue Bloon spawns a Red Bloon when popped, and some of which even have special properties such as being immune to towers that use explosives or being invisible to certain towers. The player wins by completing a certain number of rounds or loses by letting too many Bloons escape and running out of lives. The amount of lives lost per bloon is dependent on the amount of damage required to fully pop the bloon and any bloons spawned after popping the outer layer.
Career Rank
Career Rank is an experience system added in Bloons TD 4 to unlock towers, upgrades, and game modes. The player earns experience by popping Bloon layers and levels up after earning enough XP. The XP requirements of each level increase per level up. The last reward, Spike Storm, is given at Rank 34.
Map difficulty
Map difficulty is a feature added in Bloons TD 4 to give an approximate categorization of how difficult a map is. There are five categories: Beginner, Intermediate, Advanced, Expert, and Extreme. Besides certain achievements, map difficulty has no effect on gameplay besides providing an idea of how difficult the track is.
Premium Upgrades
Premium Upgrades are special upgrades that unlock permanent enhancements, either for specific towers or for gameplay elements like starting cash. In the Flash version and Expansion, most Premium Upgrades are purchased with NK Coins. In the mobile version, they can be unlocked with in-app purchases or by earning enough gold medals. In the DSi version, they can only be unlocked with gold medals.
Differences between versions
Flash version and Expansion
Bloons TD 4 Expansion is a separate game based on the Flash version that adds Specialties and replaces all tracks except Premium tracks with four new tracks. Despite being a separate game, account data across both the base game and Expansion is shared if the player is logged in with a Ninja Kiwi account, so players will keep their rank, upgrades, and premium upgrades from the base game.
Flash version and mobile version
The mobile version of Bloons TD 4 is a reissue of the Flash original for iOS, iPadOS, and Android. It is a from-the-ground-up remake in a new engine with completely redone graphics. In addition to introducing several new features, some content is absent from this version of the game, such as Sandbox. Some notable additions include Premium Upgrades being earnable in-game through beating maps on Hard, the new Beekeeper tower, and Extreme maps. Because it runs in a different engine, there are several differences in game mechanics, such as bloons always having 0.125s of immunity upon a layer being popped. The mobile version has almost all of the same content as the Flash version, but there are a few tracks exclusive to the Flash version.
iOS version, HD version, and Android version
The mobile version of Bloons TD 4 is further separated into three distinct versions of the game, iOS, HD, and Android. iOS and HD are largely the same game but HD has a different resolution than iOS, resulting in some maps having different track lengths from each other, and likewise allowing for more towers on the map. Android is on the equivalent of Update 3.5 of iOS, so it lacks Snow Monkey, also has different resolution maps, and lacks support for Achievements or leaderboards.
Mobile version and DSi version
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Towers
Bloons
Modes
Normal
In the mobile version, the three basic difficulty levels are categorized under a single mode named "Normal". This mode has the classic Bloons TD gameplay experience and is the only game mode unlocked by default. In Normal, the player starts with 650 cash by default and needs to complete a certain number of rounds to win.
| Mode | Starting lives | Cost modifier | Bloon speed | Rounds | Medal |
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 Easy
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200 | 85% | ±0 | 1–50 |  Bronze
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 Medium
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150 | 100% | +0.1 | 1–60 |  Silver
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 Hard
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100 | 108% | +0.25 | 1–75 |  Gold
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Freeplay
After reaching the last required round of the selected difficulty in Normal, the player can continue playing in Freeplay mode. In this mode, the player cannot save, rounds 75 to 249 are randomly generated, and the speed of Bloons gradually increases with each round cleared. The randomized rounds only contain Bloons ranked Camo and above. Round 250 is the final round, which contains 9,999 B.F.Bs. In the Flash version and Expansion, completing round 250 ends the game, while in the mobile version and DSi version, there is no hard round limit, though rounds 251 and above are simply repeats of round 250.
Apopalypse
Apopalypse mode is unlocked at rank 31. It uses the same costs, starting lives, and Bloon speeds as Medium mode, but rounds are randomized. Each Bloon type has a range of rounds it can appear on (for example, White Bloons can spawn anywhere between round 27 and 70). After round 70, only B.F.Bs can spawn and scaling is disabled. The round 250 hard limit from the Flash version is also disabled. This mode does not exist in the DSi version.
Sandbox
Sandbox mode is unlocked at Rank 26. It uses the same costs and Bloon speeds as Medium mode, but provides $1,000,000 starting cash and 100,000 starting lives and allows the player to spawn their own Bloons. There are no rounds and popping Bloons does not earn experience. This mode is intended to allow the player to freely test towers, upgrades, and Bloons. This mode is exclusive to the Flash version and Expansion.
Deflation
Deflation mode is unlocked at Rank 32. It starts on round 21 and provides the player with 50,000 starting cash, but the player cannot earn any more cash by popping Bloons, from Banana Farms, or using cash injections. This mode is exclusive to the mobile version and Expansion.
Challenges
Challenges are missions that come with restrictions and additional rules not found in any of the normal game modes, such as restricting which towers and upgrades can be used. Each challenge uses a specific track and mode. This mode is exclusive to the Flash version and mobile version, and each version has different challenges.
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