Sharp Shurikens is the 2nd upgrade of Path 1 for the Ninja Monkey in Bloons TD Battles 2. It increases shuriken pierce from 3 to 4, a +1 pierce bonus unlike its BTD6 counterpart, but yet the same pierce amount as its BTD6 counterpart. However, Sharp Shurikens costs less. Also, the Ninja still has 47 range.
Extra pierce for shurikens makes a decent difference to performance of shuriken's grouped-popping. It pairs well with Seeking Shuriken. However, there are no special crosspathing benefits with this upgrade.
Tips[]
Use it for early-game Ninjas to somewhat hold off grouped rushes prior to getting Double Shot.
Version History[]
Initial release (compared to BTD6 during Version 28.0)
Released
1.0.4
Sharp Shurikens costs less ($350 → $300)
3.3
Sharp Shruriken pierce increased from 4 to 5
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We have increased Ninja’s early-game potential since it stood out as a tower with relatively low DPS in the early game, always depending on another tower to deal the damage or to buff it. [...]
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~ Ninja Kiwi
3.3.2
Sharp Shurikens: $300 -> $200
Sharp Shurikens pierce bonus decreased from +2 to +1
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Ninja Monkey has spiked up in popularity since the last update, with the Ninja + Alchemist combo standing out as overly strong in all stages of the game. We have made quite a few changes to address this, such as keeping the additional +1 pierce on the early tiers but taking it back off for 2xx, with some price rearranging to accommodate. [...]