The Back-to-school Grenade is a consumable in Blitz Brigade. It's just like the Easter Egg, Heart attack and Boom-O'-Lantern a Grenade with an other skin. The skin of the grenade looks like an apple. These grenades can only be purchased during special periods in the year, even if some are already owned.
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Medikit · Invincibility Tonic · Ammo Belt · Grenade Keychain · Damage Increaser · Laughing Gas Grenade · Revolver Belt Buckle · Phoenix Insignia · Rabbit's Foot · Smiley Badge · Sword Badge · Lucky Charm · Bronze Medal · Silver Medal · Gold Medal