A

superbock in TNT is a 4x4

square made of 4 unbroken

tetris pieces. There are 43 superblocks known to

man:

0000 0000 0000 0000 0000 0000 0000
0000 = 0000 or 1111 or 1000 or 0001 or 0011 or 1100
0000 1111 1111 1110 0111 0011 1100
0000 1111 1111 1111 1111 1111 1111
where
0000 = 1111 or 1122 or 1222 or 1112
0000 2222 1122 1112 1222
(16 here)
and
0000 1332 1122 1233 1123
0000 = 1332 or 1332 or 1223 or 1223
0000 1122 1332 1123 1233
(4 here)
and
0000 1111 1112 1122
000 = 222 or 122 or 112
0 2 2 2
(9 here)
plus appropriate mirror images thereof, another 9
and
0000 2111 1111
00 = 21 or 22
00 22 22
(5 here, if we count mirror images of the first one)

Note that we don't

count rotations as

distinct, but we do count certain

mirror-images distinct (if it is not the case that a

rotate will accomplish the same

transformation, i.e., the J and L pieces and the 2 S pieces).

The key to having a 600+ Sprint game is to make partial superblocks whose top row is complete. That way, you can stack up to 5 uncompleted superblocks on each side, and fill them in with whatever pieces come. Variety is also key, especially when it comes to using S pieces. Make as many superblocks as you can that have S pieces (there are quite a few, but are non-trivial to make).