Gem Miner Decisions

Gem Miner Decisions is a mining strategy game about choosing how deep to dig and when to escape with the gems you have collected.
You control every move of the expedition. Use Careful Dig to move one layer, use the limited Power Drill to push two layers for stronger rewards, place support beams to improve cave integrity, and scan the next layer to estimate danger before committing to another dig.
Your objective is to collect enough gem value to meet each shaft target, then reach the exit before oxygen or cave integrity reaches zero. Deeper layers can reveal emeralds, rubies, sapphires, and rare Starstones, but cave-in risk increases as the expedition goes farther underground. A failed escape loses the unbanked haul.
Ten mining shafts unlock in order, with different depths, targets, resources, and starting danger. Gems brought safely to the surface are added to your local collection and bank. Banked value can improve the drill, support kit, and scanner for later expeditions.
Features
• Decision-based mining with careful digs, power drilling, reinforcement, scanning, and manual escape choices.
• A visible danger meter shaped by depth, cave damage, shaft difficulty, and temporary support protection.
• Five gem types with rarer and more valuable finds appearing deeper underground.
• Ten unlockable shafts with distinct depth limits, target values, oxygen, tools, and cave-in pressure.
• Three local tool upgrade tracks for the drill, support kit, and cave scanner.
• Best haul, best depth, gem collection, achievements, and last selected shaft saved on the device.
• Pause, resume, restart, retry, next-shaft, and safe home navigation.
• Offline gameplay with no account signup required.
Plan each move, decide when the reward is worth the risk, and bring the best possible haul back to the surface.