Cross-sectional task

Tetris

• Blocks:
  
• Rules:
  • size of the board: 12 x 24
  • using keys:
    • left and right arrows - move the block
    • up arrow - rotate the block
    • down arrow - drop down the block
    • '+', '-' - change speed of folling blocks
  • show number of the block in window's title
  • show message box at the end of the game
• Don't let the scene flicker during animation (flickering during resizing is acceptable)