The game window has three main areas:
By default, the pieces are green and the board is blue (you can change this; see the Options help section). The status area at the bottom right tells you the current player name, level, and provides buttons for common operations.
How to move pieces
Play consists of placing the pieces on the board.
To move a piece, simply click and drag it onto the board, releasing over the desired spot (you do not have to be exact).
Shortcut 1: If you drag a piece and release the mouse over a square, and the piece only fits onto the board on that square in one way, then it will make the move. If the move is not possible, or can be done in more than one way, it will not make the move and the piece will snap back to its original position.
Shortcut 2: If you click on a square on the board, and one (and only one) piece can cover that square and in only one way, then it will make that move.
How to flip and rotate pieces
You do not have to move pieces onto the board in whatever orientation they're currently in. Before moving a piece, you can flip or rotate it to your heart's content.
There are a variety of methods to rotate or flip a piece. Choose the one or combination which you feel most comfortable with. Here are the different methods, the first one being the suggested method:
Click on a piece while holding down the Control or Option key.
You can also show this pop-up menu by double-clicking a piece (keep holding the mouse down after the second click).
Click the buttons in the status area.
Press the arrow keys on the keyboard
Press the 'a', 'd', 'w', or 's' key.
Press the space bar.
When you can't flip pieces
You can't flip pieces if the 1-Sided Pieces option is currently selected. By default, 2-Sided Pieces is selected.
Strangely enough, selecting 1-Sided Tetrominoes or 1-Sided Pentominoes does not prohibit flipping pieces. Although it makes more sense to select the 1-Sided Pieces option if you use those piece sets.
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