Mining Mania is an incremental game you can pick up and put down at any time, play for 5 minutes, an hour, doesn't matter. There's no stress, no ads; forced or optional. You tap the rocks, the rocks break, you get coins. You spend the coins to get stronger, and break more rocks. Discover many upgrades along the way, maybe invent time travel for the sole reason of breaking more rocks, and eventually explode the whole screen every tap!
DESTROY THE MINE! Pick up and put down any time.