The monthly sudoku contest on argio-logic.net will be held on 13th March.
It is open for 24hrs, so you can give it anytime on Saturday.

See http://www.argio-logic.net/indexuk.php?p=contest for more details.

There is no IB for the contest. If you have any doubt, you can ask on the forum.
The sudokus of March contest are:

1. Classic Mini (6x6)
2. Jigsaw Mini (Irregular 6x6)
3. Tris (Trio)
4. Sum (Triple Sum)
5. Subset 3x3 (Instructions are given on the same page)
6. Classic (9x9)
7. Diagonal (Diagonal)
8. ABC End View (Numbers outside the grid appear first from the corresponding direction)
9. Mirror (Just like the Mirror in Mock Test 15)
10. Anti Knight (Anti Knight)
11. Queen (I dont know yet)
12. Jigsaw (Irregular)
13. Quadruple (Quadruple)
14. Untouch (No Touch)
15. 4 Box (Windoku)
16. Kropki (Kropki: Red Bar = Black Dot, Blue Bar = White Dot)
17. Outside (Outside)
18. Neighbours (Not sure yet)
19. Killer (Killer)
20. X Frame (Sum Frame + Diagonal)

Please post here if anyone knows the instructions of the 11th and 18th puzzles.

P.S: It is an online contest, you have to solve all the puzzles online in flash. Please practise the archives if you have not participated before, its a different format of flash-solving.

If anyone has any doubts regarding any sudoku, feel free to ask...

What is triple sum?

http://rohanrao.blogspot.com/2009/01/rules-of-triple-sum-sudoku.htm...

I first saw it in Sudokucup 1.

Queen Sudoku: (Number '9' is a chess queen, and no queens can attack each other. In other words, no '9' can repeat in a row/column and along any diagonal, even smaller diagonals)

Neighbours Sudoku: (Shaded cell indicates that sum of horizontal neighbours = sum of vertical neighbours)