These toys include racing cars that stop if a child gets too excited and, for even younger children, a cooperative game where children try to help each other stack blocks (if heart rate goes up, the table becomes wobbly and the blocks topple).

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This charming little platformer is a cooperative-play game that has two opposite planes of gravity.

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Finally, a great deal hinges on the cooperative nature of the game.

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There are artificial tornadoes in glass tubes, a creepy video art installation, a cooperative Pac-Man game, and a place to send text messages to fish.

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