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To The Core is a game about exploring the underground and taking advantage of hidden resources below the ground. With a modern submarine, you continue to dig deep underground. Mine materials to improve your ship.
You can explore many other planets.
The unit here is “fuel”. To return home, you need 60 “fuel”. “Fuel” is your strength. When digging into underground rocks, you will lose strength faster.
Collect a lot of iron, it will be necessary for you.
Don't forget to “Go To The Shop” and discover 5 visible upgrades; Drill Damage, Vision Upgrade, Silicon Plating, Ore Extraction & Fuel Tank+.
Drill Damage: Increases the damage done to rocks breaking them faster
Silicon Plating: Reduces the damage done to your ship when hitting rocks
Ore Extraction: Improves the amount of materials dropped by rocks
Fuel Tank+: Increases the amount of fuel you have.
Vision Upgrade: Allows you to view more planets on the planetary map, this upgrade (and it's later versions) should be the goal as unlocking this allows you to access new materials for other upgrades.

Utilize A and D to move left and right, and let gravity draw you down. When you strike a rock, you will be thrown back a good distance, which you may utilize to go back up.