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Tool: Circle 0
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Description: Position the 14 numbers inside of the circles and intersections of circles in such a way that the three numbers in each of the circles sums (adds up) to zero.
Technology Type: Java Applet 
Guide: User's Guide (opens a new window)
Author: National Library of Virtual Manipulatives (Utah State University)
Language: English 
Cost: Does not require payment for use

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Comment:This is more than just naked number calculations with positive and negative integers-it makes the player use strategy and be aware of more than one math operation at a time.
Comment:The game involves quite a bit of strategy (which may be a good or a bad thing). Due to this, the user ends up doing much more calculating and re-calculating number combinations in order to win the game.