Beat Brawl Bosses with Pierce (Strategy Guide)

Cleared Stage 3 easily. Gadget: Shield, Star Power: If you have it, use the 2nd Star Power (increases movement speed for better survival). You absolutely must pick the 'Double Cannonballs' Nano ability (if it doesn't appear, the game is ruined). With this, if you spin in small circles while spamming auto-aim, you'll fire tens or hundreds of shots. Hope everyone can get their rewards with this!