Four in a row
Take turns dropping a disc into a column. The first to line up four — across, up or on a slant — wins. Easy to learn at any age, and there is more to it than it looks.
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Online rooms are private: only someone with the code can join. There's no chat and no account — each player gets a friendly temporary name, and the room is gone shortly after you leave. If a child is in the room, it follows Spark & Anvil's children's rules.