When injured, the Blastworm will roll into a spiny ball that detonates on contact.[2] Link can blow Blastworms about with the Whirlwind to use them as exploding projectiles. This is useful for completing puzzles in the Forest Temple—destroying blocks and activating out-of-reach switches—as Link has obtained neither Bombs, the Boomerang, or the Bow at this point in the game.[3][4] Blastworms are naturally docile, though they will crawl towards Link if he comes too close.
Blastworms resemble caterpillars or other larvae. In fact, Stagnox hatches them during the second phase of the battle. Link uses this to his advantage, blowing them back at Stagnox to cause damage.
↑"Strike [a Blastworm] with Link's sword to make it curl up into a spiky ball that's dangerous to the touch. . . . Keep a distance from a curled-up Blastowrm; it's about to explode!" (The Legend of Zelda: Spirit Tracks Prima Official Game Guide, Prima Games, pg. 73)
↑"Since you can't safely pick up these living bombs, use the Whirlwind to knock one into the east bomb blocks instead, which makes them the blocks and the Blastworms explode." (The Legend of Zelda: Spirit Tracks Prima Official Game Guide, Prima Games, pg. 73)
↑"With the bomb blocks out of the way, launch another Blastworm at the switch to activate it." (The Legend of Zelda: Spirit Tracks Prima Official Game Guide, Prima Games, pg. 73)
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