Battle Arena (BTDB2)

Battle Arenas are the main form of progression in Bloons TD Battles 2. These are very similar to Bloons TD Battles 1 Arena, except medallions are swapped out for non-purchasable trophies this time. These trophies are obtained strictly through winning games, but bonus trophies are rewarded for a win streak of 3 or more. Trophies are also used for matchmaking. There's a progressively increasing trophy threshold for each arena. However, if a player falls below the trophy threshold, the player will be downgraded by one arena (cannot go down to red bloon camp, since the minimum arena is the yellow stadium once the player reaches Yellow Stadium). Once the player earns 100 trophies, they are entered into the Hall of Masters. The Hall of Master's mechanics is very different from the base arenas.

The Arenas
There are 8 Arenas in Bloons TD Battles 2, not including the Hall of Masters. The minimum arena once surpassing Red Bloon Camp is Yellow Stadium.

Hall of Masters
Hall of Masters is a unique arena with very different gameplay. It works on an elo system.

Summary
To get to higher-tier arenas, obtain a decent strategy and build upon it. Also, you should adjust your strategy to cater to each map and opponent style. There is no one best strategy, so your playstyle can fit any nooks or crannies.

Gallery
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Trivia
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