Hydro Maze
http://www.carstensstudios.com/mathdoodles/hydromaze.html
Guide the ball through all eight golden tunnels. Click on two sections of the maze to transfer water from one section of the maze to the other. Clicking on a red valve will open and close a section.
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Links
This link, Hydro Maze: http://www.carstensstudios.com/mathdoodles/hydromaze.html
Give to students: http://gomaths.net/1914
This link on MathsLinks: http://mths.co/l/1914
MathsLinks: http://mathslinks.net