The special blocks have the following effects:

(A) - Adds a row/line.
(B) - Removes all special blocks from field.
(C) - Clears a row/line from play.
(G) - Gravity pulls all blocks downward and clears multiple rows/lines.
(N) - Nukes a field... clearing all blocks.
(O) - Block Bomb, clears a 3x3 area around other O blocks.
(Q) - BlockQuake shifts blocks randomly left or right or not at all.
(R) - Removes 10 random blocks from field.
(S) - Completely switches a player's field for that of another.