Trominoes

Let me tell you about trominoes.
A tromino is a shape made up of 3 identical squares.
The squares can be joined in a line, to form a stick or turn a corner to make an arrow.

Each tromino can be moved by putting your finger on a plain, blue square and dragging.

You can turn a tromino by touching a clock-face drawn on a square:

- Touching the 3 oclock face turns the tromino on its side.
Touch it again and it turns back.

- Touching the 6 oclock face turns it upside down; touch it again to turn it back again.

You can turn an arrow-shaped tromino three-quarters of a full turn by touching one clock face after another, and back again.

Each tromino puzzle has a grid of green squares and some blue trominoes.
You have to fit all the trominoes on the grid with no overlapping and without leaving any empty squares, a bit like a jigsaw puzzle.
You can even event your own shapes.

Have a go and see how you get on.,

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