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Cookie Clicker: best for the classic, with cloud saves and achievements
Platform: Browser, Steam, Mobile · free
Orteil's Cookie Clicker started on the web in 2013 and is still being updated. The Steam version ($4.99, Windows and Mac) is the official release, with over 600 upgrades, over 500 achievements, minigames, a dragon to pet and cloud saving. 96% of its 93,511 Steam reviews are positive, a score few games of any genre reach at that volume.
You click a cookie, buy grandmas, then farms, factories and portals, and eventually ascend for heavenly upgrades. It looks simple and turns out to be strange and layered.
Pick it if you want one idle game that will last for years of on-and-off play.
Watch out for: The web version is still free at orteil.dashnet.org. The $4.99 buys cloud saves, Steam achievements and supports the developers, not a different game.













