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Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
PhET Interactive Simulations - Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Physion - Physics Simulation Sandbox
Roblox - Reimagining the way people come together.
LabsLand - LabsLand lets students access real educational laboratories through the Internet.