Once you complete enough levels and acquire enough keys the Graveyard will be available. It can be found in the upper-left door in the Dungeon Area. There are 23 levels in all at the Graveyard. This area has some of the most fun and entertaining stages in the game where you can fly, float, and glide to pick up gems. There are zombies in this area as well so beware.Zombie Boss Fight
After a while you will unlock the "Scarezombie" level where you must defeat a hopping shovel zombie. This is a very easy boss. Just pick up the 3 green crosses scattered around with R-trigger and place them so that he comes in contact with one of them. Once he does he will drop gems, collect them to clear the level.