Well I never knew that CSS can really produce such amazing effects that even games and puzzles can be created by it. cssplay is doing same thing , all examples and demos are worth checking and you will love them all. I have collected 10 demos which I liked most.
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1. Calculator
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2. Tic Tac Toe Little Javascript
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3. Cops and Robbers – CSS puzzle
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4. Not so simple photograph gallery
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5. Tower of Hanoi puzzle
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6. Lamp Light
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7. Tunnel Vision
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8. The streaker
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9. Alert Box
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10. It’s amazing wot CSS can do
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That’s all
Cheers!!