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Three yes or no questions about tomorrow's weather where you live. Each one is set right by the forecast, so copying it is a coin flip.
The forecast says 13.8°, just under. Think it'll be warmer than that? Say Yes. A right answer scores 10.
Rain's likely, so a right Yes scores less. Back the long shot and get it right for 18.
Free, no signup. Answers close at midnight.
Start one for your group chat, then send them the link.