| http://www.w3.org/ns/prov#value | - The presentation of Qvoid is almost perfect - the clean 3D style is bold and clear, making each puzzle easy to absorb at a glance while also providing subtle touches such as changing expressions on the white cube; gently rocking forward to show you can not move that way; and showing your movements in reverse with tracking lines when undoing the last move you made.
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