Acquire a specific amount of stars from completing stages to unlock new hammers in the "equip" tab.

Unlockable	How to unlock
Black Iron	26 Stars.
Blazing Hammer	70 Stars.
Bronze Hammer	13 Stars.
Bullfighter	340 Stars.
Cries of Phoenix	490 Stars.
Crown Jewels	280 Stars.
Crystal Killer	130 Stars.
Death Crusher	180 Stars.
Dragon Claw	160 Stars.
Hades	650 Stars.
Heaven's Blow	580 Stars.
Ice Breaker	100 Stars.
Judgement	200 Stars.
Lightning	410 Stars.
Orichalcum	230 Stars.
Orichalcum II	740 Stars.
Rage of Earth	145 Stars.
Rock Hammer	1 Star.
Silver Hammer	40 Stars.
Steel Hammer	55 Stars.
Thorny Hammer	85 Stars.
Thunderbolt	115 Stars.
Wyvern	540 Stars.