DotPlus

A number-matching puzzle that runs on a chain timer. Blocks carry values; you click or drag them to add those values to a running sum, and when the sum reaches the target the group clears and a chain begins. The chain is the whole game — it keeps burning down, and the only way to hold it is to find the next matching group faster than it drains. That turns plain arithmetic into a speed problem, which works far better than it sounds. DotPlus asks for arithmetic you already know, performed quicker than is comfortable.