Buy a dog.
Buy a boss.
Buy all golems.
Destroy 20 chests
Kill the dragon!
Unlock the dungeon layer
Have an archer, heavy knight and wizard
Have 100K gold.
Unlock the ice layer
Unlock the mountain top layer
Click on a crystal
Buy Angel and Death
Buy all bosses.
Have 5 peasants at once
Unlock the rocks layer
Buy a unit until its sold out.
Buy 3 pigs and a wolf.
Have 4 skeletons and 4 necromants
Unlock the vulcano layer
999
580342
1139869
609150
310147
143076
110329
16790