Unlock Egg Vaccum:
Beat normal story (the middle 3 stages on the map).
Unlock Samarui Blade:
Beat dark story (the top 3 stages on the map).

Unlock Heal Cannon:
Beat hero story (the bottom 3 stages on map).

Unlock Satelite Laser:
Beat semi dark story (the top middle 3 stages on map).

Unlock Omochao Gun:
Beat semi hero story (the bottom middle 3 stages on map).