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Online chess
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Lichess, the free, ad-free chess server. Every line of code is public.
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The Powder Toy
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A falling-sand physics sandbox with hundreds of elements. Burn, freeze, explode and invent.
Why it matters
Makes heat, pressure and chemistry something you can play with.
Parents and players: The online save browser contains user-made content. Parents should supervise.
Pro tips
- Press space to pause so you can inspect what is happening.
- Start with water, fire and plants, then try the heat and pressure views.
Placeholder artwork. We are still looking for an official screenshot.
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