Hardland Premium characters are characters that can only be purchased with money in an In App Purchase. There are currently only three character packs.
1) Ganster Gore, Kid Gore, White Gangster Gore
2) Santa, Easter Bunny, Undead Jenny Gore, Zombie Gore
3) Grandma, Grandpa, Elder Gores, Emperor Penguin, Penguin Mob.
Once an In App Purchase is bought, all updates to that pack are free.
Note: You must be connected to the internet to buy the In App Purchases.