FAQ

There are 26 unlockable classes as of September 2026, released between 13 March and 18 September. Core prices run from 100 for Miner up to 30,000 for Goblin King, Bounty Hunter, Pirate and Executioner. The all classes page lists every one with its release date.

No. The game has no promo codes and no Codes button in the lobby. Cores — the currency that buys classes — come from achievements, daily quests, chests and breaking boss walls, and any page offering free Cores for a code is describing a different Roblox game.

Eleven layers sit between the surface and 1,000,000 m, then the Heart of the Earth continues beyond it. Boss wall HP climbs from 100 in the Grass Layer to 500,000 before the 100 km mark and 5,000,000 at the Heart of the Earth. The layers page has the full depth and HP table.

RPM Overclock, Ultra Drill and Power Burst used together. RPM Overclock makes the drill hit more often, Ultra Drill adds stacking damage while drilling nonstop, and Power Burst multiplies whatever has accumulated during a 5 second window. No combat upgrade keeps pace with boss wall HP on its own.

Prepare for three failure points: carry 3 to 7 coal or more for the Void Clay Wall Boss at 17,000 m that empties your fuel, expect the 25,000 HP boss wall step at 41,000 m, and bring 1 to 2 Golden Medkits or a Revive Kit for Wolf Bat at the Glowing Core wall. The 100 KM guide walks through the whole run.