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Sai in action.

Not to be confused with Sai the Shadow, a character in Bloons Adventure Time TD.

Sai is the fifth upgrade of the boomerang core in Bloons Super Monkey 2. This upgrade makes the monkey shoot two "rings" of bladed sai that orbits the monkey similarly to the rest of the rang core upgrades. It is very deadly as it can seek out bloons and slice through shields with ease. However, it can be easily overwhelmed by fast-moving clumps of shielded bloons.

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