Bloons Tower Defense is the first game in the BTD series, released on August 16, 2007, as a free flash browser game. Following the 2020 discontinuation of Adobe Flash Player, this initial entry was preserved through the use of Ruffle and WebAssembly-based emulation. As of 2026, the original 50-wave experience remains accessible via legacy web portals including Armor Games and CrazyGames, allowing for the continued study of the series’ early balancing and tower mechanics on modern hardware.
In this first entry, players must defend against waves of different bloons with a small roster of towers which the player can position around the map. Bloons have a varying amount of layers, with each layer being pierced revealing the layer underneath until the bloon has been completely popped. If all 40 lives are lost, the game is over. If all 50 waves are passed, the player will win the game.
The game has 5 towers, the Dart Tower, Tack Tower, Ice Tower, Bomb Tower, and Super Monkey, which all appear in future Bloons Tower Defense games with minor name changes.





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