Merge the Gems

Numbered tiles stack up on a grid, and pushing two matching numbers together bumps the result up by one — familiar merge logic, except here the board keeps sending down new rows on its own schedule, ready or not. The target number is 30, and reaching it clears that tile for good. Early rows are forgiving, but once three or four stacks are running at once you have to think about which merge frees up space rather than which one is simply closest to done.