Competitive FreeCell with timed deals and a global ranking, which should not work as a concept and completely does.
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Freecell.net sits in Card Games under Play, and we have it filed as coffee break — five to fifteen minutes of proper attention. It reads as competitive and brainy.
Solitaire in its many disputed variants, plus card games you can play against strangers without owning a deck or explaining the rules.
Where the bridge world actually plays: free tables at every hour, tournaments, and teaching rooms of remarkable patience.
Thirty-odd card games with competent bots, no accounts and nothing covering the table. The default answer to fancying a game.
The deck-building game that invented the genre, officially online, with a free rotating selection of kingdom cards.
Yu-Gi-Oh played manually against real opponents, with every card ever printed and no automation to hide your mistakes.
Solitaire variants you have never heard of, with a hint button and an interface built by somebody who actually plays them.
John McLeod's encyclopedia of card game rules, covering every regional variant of everything and settling every dispute.
A virtual table with real decks you drag around by hand, for playing whatever house rules your group refuses to drop.
Spin up a private poker table and send the link round: no accounts, no downloads and no actual money involved.