Clicker and idle games start almost embarrassingly simple. You click something, a number goes up, and you use that number to buy something that makes the number go up faster. What keeps people playing is what happens next: the upgrades compound, and progress that took ten minutes at the start happens in seconds later on. Many of these games keep earning while you are not playing, so coming back after a break means finding resources waiting. Dubdoo's clicker category includes mining and merging games, business and factory simulations, incremental RPGs and games that are mostly about watching a system grow. They demand very little attention, which is exactly why they work well alongside something else. All of them are free and run in your browser.