What is the game called which involves dominoes?

I wil try and explain, when you stack dominoes against each to form a line and knock the first one down, and the rest follow suit.





I remember years ago there you can buy a game that is specially designed for this,to set it up in different ways like a track.








What is it called? I'm trying to find it on-line but no idea what's it called.|||vaguely remember it domino magic?|||They are called Falling or Cascading Dominoes.





http://www.math.udel.edu/~pelesko/Teachi鈥?/a>





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