...ain/java/com/comandante/creeper/managers/GameManager.java

src/main/java/com/comandante/creeper/npc/Npc.java

...java/com/comandante/creeper/player/ExperienceManager.java

src/main/java/com/comandante/creeper/player/Player.java

.../com/comandante/creeper/player/ExperienceManagerTest.java

src/test/com/comandante/creeper/player/NpcTestHarness.java

world/npcs/swampberserker.json

world/npcs/treeberserker.json