Combat Arena
Successfully complete the game.
Easy Orbs
Go to the Combat Arena and set your health and magic to infinite. Select the Easy difficulty setting and any desired enemies (Cyclops Tyrant and the Minotaurs recommended) in the largest number possible. Use the "Scourge of Erinys" power (at maximum, if possible). Because you have unlimited magic and health, repeatedly press Left to get easy Orbs.
God mode
Successfully complete the game.
Play as zeus/gravedigger in the regular game
Successfully beat the game on EVERY difficulty. Note: You have to beat god mode 3 times.
The Temple of Zeus
Successfully complete the game.
Various costumes
Complete the indicated task to unlock the corresponding costume.
Deimos: Complete the game.
Ghost Of Sparta: Beat the game in God mode.
God Armor: Complete the game.
Legionnaire: Enter unique code provided as pre-order bonus.
Robot : Purchase from the Temple Of Zeus for 70,000 orbs.
Zeus/Gravedigger: Unlock all other bonuses at the Temple of Zeus, solve the puzzle, and use the shovel. Note: Only usable in combat arena.