A Tetris clone with beautiful VGA graphics and the special
feature of the 'NOT', which is explained in the manual as
follows:
When four lines are cleared simultaneously the player receives a 'NOT'.
For each 'NOT', a notch is cut out of the border on each side, starting
from the bottom. This represents the number of 'NOT's obtained by the
player. When the player clears four more lines simultaneously after
previously receiving a 'NOT' but before clearing any other lines, the
player is awarded with a double 'NOT', two 'NOT's.
The 'NOT' is used to clear lines. When activated, each 'NOT' clears
its respective line. All 'NOT's are activated simultaneously. If the
blocks reach the top, normally ending the game, the 'NOT's will
activate automatically.