• You will start from the first tier (tier I, indicated with Roman numerals). Once you completely upgrade the Mine (Elevator, Warehouse, all Mineshafts to max level), you will be able to access the following tier (tier II, tier III and so on, up to tier V/5).

  • When you start a new tier, the progress and Frontier Cash of the Mine will reset. However, Frontier Credits, Sparks and currently active Multipliers will carry over to the next tier.

  • The progress in the Frontier Mines won't be carried over when a new Frontier Mines Event starts.