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NXT whac-a-mole - Part 2

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Continueing on from the post yesterday.... about the double NXT Whac-a-mole construction.

Today we been working on another module of the robot - the score tower - which uses the caterpiller tracks to move the pointer up and down:

The tracks (that came with last year's TECHNIC Bulldozer) is extremely useful. Most people use the tracks for moving a vehicle. e.g. Like the TECHNIC Bulldozer.

You can also use the tracks to move an object attached to the tracks from part of the robot to another - like we have done for the second module of the Whac-a-mole today

The tracks moves a LEGO mole up and down on a long tower. The idea of the game is that the player whacks the moles that pop their head. As you whack more and more moles, you get higher points. And as you get more and more points the mole gets higher until it touches the top touch sensor - then the pointer returns to the base and starts the next level - just like the ones you see in carnivals.

It is way easier to implement than using linear gears, pulleys or anything else.

Can you think of any other uses for the tracks?
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