Hidden items:
Some levels contain hidden silver chests with high level equipment. These items can not be made by forging, upgrading or be bought in the market. The chests are harder to reach than regular chests and may result in depleting your energy and technology so that you cannot complete your challenge. The hidden chests look the same as regular chests.
Note: The Sturdy Diamond Pick requires a Sturdy Gem Backpack to acquire, as it provides a +1 Tunneling Shovel distance.
