Instructions

Best viewed in full screen mode: press F11 if you are using Internet Explorer or Firefox.

Click on 'play' then watch the triangles dance round the screen.

When they have finished the aim is to transform the triangles on to their shadows using as few transformations as possible. Low number of transformations = high number of points.

Use the buttons on the left to move the triangles.

A triangle will flash when it lands on its shadow. Wait until a triangle has stopped flashing before trying to transform the other.

There are 8 rounds of transformations: six 'take your time' rounds when you can take your time and think about the transformations and two rounds against the clock. The time allowed in the two timed rounds depends on your score: the higher the score, the more time allowed. Click on the 'next' button in between rounds.

The button at the bottom turns the lines y = x and y = -x on or off.