In To The Core, you drill and use resources from the planets of our solar system to drill deeper and further.
A solar system awaits you, with plenty of planets to find and drill their resources, but be careful not to waste any fuel if you wish to drill more.
Each planet is stronger than the last, so you'll need upgrades as you explore the expansive solar system.
You can use these resources to increase your drills durability, fuel, damage and add quirky upgrades by traveling to the planets and gathering as many resources as you can before fuel runs out.
As you collect items in the game, they will automatically mastery with each mined resource, so if you mine 100 iron, the drop rate will increase by 5%.