Importing classes and declaring first variables

The first thing we need to do, as usual, is set up the project and define the main class and function, as well as preparing the game field.

Create a new file (File | New) then from New Document window select Actionscript 3.0. Set its properties as width to 400 px, height to 480 px, background color to #333333 (a dark gray), and frame rate to 30 (quite useless anyway since there aren't animations, but you can add an animated background on your own). Also, define the Document Class as Main and save the file as tetris.fla.

Without closing tetris.fla, create a new file and from New Document window select ActionScript 3.0 Class. Save this file as in the same path you saved tetris.fla. Then write: ...

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