Extreme Sudoku Deathmatch Classic (download now)
A Sudoku game played across all the cells of a 3d cube. Contains regular sudoku as well. Made with Torque.(alpha version)

Examples:

16x16 grid

C0D1|79F4|BE53|68A2
E9A8|51D2|64CF|B370
7F35|8C6B|012A|49DE
246B|03AE|789D|15CF
----+----+----+----
0123|4576|89AB|CEFD
4576|1023|CDFE|8A9B
8A9C|BDEF|1032|5467
BDEF|98CA|4567|0123
----+----+----+----
1204|3657|9AB8|DFEC
3657|2401|DFEC|9B8A
98CA|EFBD|2301|7645
DBFE|CA89|5674|2031
----+----+----+----
5310|6E4C|A2D9|F7B8
6742|AB30|FC85|ED19
AC8D|F795|EB16|3204
FEB9|D218|3740|AC56

a 25x25 grid:

abcde fghij klmno pqrst uvwxy
fghij klmno pqrst uvwxy abcde
klmno pqrst uvwxy abcde fghij
pqrst uvwxy abcde fghij klmno
uvwxy abcde fghij klmno pqrst

bcdef ghijk lmnop qrstu vwxya
ghijk lmnop qrstu vwxya bcdef
lmnop qrstu vwxya bcdef ghijk
qrstu vwxya bcdef ghijk lmnop
vwxya bcdef ghijk lmnop qrstu

cdefg hijkl mnopq rstuv wxyab
hijkl mnopq rstuv wxyab cdefg
mnopq rstuv wxyab cdefg hijkl
rstuv wxyab cdefg hijkl mnopq
wxyab cdefg hijkl mnopq rstuv

defgh ijklm nopqr stuvw xyabc
ijklm nopqr stuvw xyabc defgh
nopqr stuvw xyabc defgh ijklm
stuvw xyabc defgh ijklm nopqr
xyabc defgh ijklm nopqr stuvw

efghi jklmn opqrs tuvwx yabcd
jklmn opqrs tuvwx yabcd efghi
opqrs tuvwx yabcd efghi jklmn
tuvwx yabcd efghi jklmn opqrs
yabcd efghi jklmn opqrs tuvwx