If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Deep Digg is an addicting classic game, there is hard mode and easy mode. In the hard mode, the air supply decreases over time, each rock dig consumes 20% air. In the easy mode, the air only decreases when you dig, one color ore consumes 1% air, one rock 5% air.
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