To The Core is an incremental game built around drilling into planets and turning their resources into improvements. Its solar-system setting gives that loop a sense of progression: planets offer different resources, and each one is described as stronger than the last. Players travel between them to seek materials while managing the fuel needed to keep drilling.
Fuel makes each expedition a matter of resource management rather than simply digging without pause. The game asks players to gather what they can before fuel runs out, then invest those materials in drill durability, fuel capacity, damage, and other upgrades. Improving the drill enables deeper efforts, while the choice to conserve fuel or continue collecting shapes how each trip unfolds.
Resource collection also feeds an automatic mastery system: mining a material more often grants that resource additional buffs. That accumulating progression distinguishes the game’s upgrade loop from a sequence of one-off mining runs.
