Chests

Chests are the player's primary source of rare resources. This makes them extremely valuable.

There are three types of chests; free, rare, and legendary.

Free Chest
Free chests can be obtained intwo ways; by completing expeditions and by watching advertisements.

Advertisements
Advertisements are about 30 seconds long, and grant a free chest upon completion. The player can watch five advertisements at once, before having to wait for a timer to reset. The player regains one advertisement every ten minutes up to the maximum of five. This means that it is potentially possibly to watch 240 ads every day in order to receive 240 free chests.

Expeditions
Currently there are only 35 expeditions to complete, 20 in the first cave and 15 in the second. Each expedition costs more coins and takes more time than the last one, so this is a very slow way to get free chests.

Opening
Each chest contains 4 different resources with quantity and type corresponding to the player's progress into the mine. The chest also has a 10% chance to contain one random rare resource.

Opening chests can be done instantaneously by clicking on the chest icon in the chests list, then immediately click on the exploration tab at the bottom, (magnifying lens) and click on the chest tab again. You won't be able to see the contents. But it will save a lot of time.

Because the rare resource makes the chest contain five items instead of four, you can tell whether or not the chest will contain a rare resource as soon as the first resource is out of the chest.

Rare Chest
Rare chests can be bought in the market for 15 gems. They will always contain three random rare resources. Because the purchasing value is lower for the rare chest than the legendary chest, it is suggested that players never buy this one.

Players also receive a rare chest by inviting a friend, once that person completes the tutorial.

Considering only the rare resources, buying this would be the equivalent of watching about 30 advertisements.

'''The best way to acquire rares chest is by doing guild events. Depending on the round you reach, you can get dozens of rare resources.'''

Legendary Chest
Legendary chests can be bought in the market for 70 gems. They will always contain 15 random rare resources. The legendary chest contains as much as five rare chests, but costs five gems less. This means that legendary chests give about a 7% discount in comparison to the rare chests.

Considering only the rare resources, buying this would be the equivalent of watching about 150 advertisements.