T Puzzle(Oriental Tangram)

This is a two-dimensional puzzle called the T-puzzle.
This puzzle is not easy. You might want to give up, but you will get a sense of accomplishment when you finish. The goal is to use four puzzle pieces to make one larger shape. There are 100 possible shapes.
[Instructions]
1. When you click a shape, the shape rotates by 45 degrees.
2. When you click and hold a piece, the piece flips vertically.
3. To move a piece, you click and drag it.
4. Without overlapping the four pieces, you must create a given shape.

There are lots of potential shapes you can make.