There will be two flavours. One rated "Extra Hard", i.e. somewhat harder than a "Ruud Very Hard" and one rated "Die Hard", i.e. yet harder, but hopefully not as hard as a Nightmare. The only difference is that the Die Hard version has two givens less than the Extra Hard version.
Thanks to Nouggie

For SCE #2 already next Monday or Tuesday.
EDIT:
I’m sorry to disappoint you, but there will be no .CLU files. There reason is that a .CLU file saved by the Clueless Helper on one PC cannot be read by a Clueless Helper running on another PC. Nouggie found this out and sent me an email. I have verified these findings.
THERE WILL BE NO PAPER COPY

But later today or tomorrow the files "Clueless.xls", "Clueless.bmp", "Clueless_A4.doc" and "Clueless_LETTER.doc" will be available here. In the thread "How To Make Clueless Explosions" I will post a guide describing how you with these files can make your own paper copy. Clueless.xls will contain a macro (Ctrl+V) that pastes the Sudoku code from the clipboard directly in to the worksheet; nothing fancy, but it will get the job done. Once in the worksheet, you just have to screen-shoot it, polish it in the paint file and put it into the MS-Word file and print it out. It’s all really simple.
@TKollen:
If you crack the .CLU format what about making a Sudoku-Code to .CLU converter. A simple DOS command line program should be sufficient, reading the Sudoku-Code file and outputting the .CLU file.
Here some hints on the "Extra Hard" version:
It has many hidden pairs and triplets, more X-Wings than the average Clueless, a couple of XY-Wings and XY-Chains, and one Colouring and/or an XYZ-Wing, dependent on how you solve it. But nothing more advanced than that. When it gets hard stay focused on the grids 1, 2 and 3. I have now solved it 2 times, the second time carefully noting the techniques I used and consulting SadMan for easier approaches.
Code: Select all
EXTRA HARD:
...........7......5....92.7.....4..1..4...5....5..8.3...2...........36...8.64..9.
3..6.............72....91....9..1..............62..783.....5.....3.....8.7...83.5
5..8.............9..9..741...1..............69..4.61...3..7...4...........8.5...3
....39...5........2.....1.8.2...4.....4.....9...36...5.4..7..6...6...9.......2...
..6.3............98...1...7..5.7......7.....2.....63...4...1.5...1.......5...762.
3....7...........6..6.2..5......3.....3...2.8..1..45....8..1.9...4..8..2.9.....8.
54..1..........3.......8..7.....2...4.....9....2.6...5.8...7.....1..35...5....6..
.................55..3.91......4......2..3..8..5.8..7..7...1.5.........4.8....3..
....2....2.6.....7.....91....1..2.........3....3....81..9..8.5...4.....8.8..9..7.
Code: Select all
DIE HARD:
...........7......5....92.7.....4..1..4...5....5..8.3...2...........36...8.64..9.
3..6.............72....91....9..1..............62..783.....5.....3.....8.7...83..
5..8.............9..9..741...1..............69..4.61...3..7...4...........8.5...3
....39...5........2.....1.8.2...4.....4.....9...36...5.4..7..6...6...9.......2...
..6.3............98...1...7..5.7......7.....2.....63...4...1.5...1.......5...762.
3....7...........6..6.2..5......3.....3...2.8..1..45....8..1.9...4..8..2.9.....8.
54..1..........3.......8..7.....2...4.....9....2.6...5.8...7.....1..35........6..
.................55..3.91......4......2..3..8..5.8..7..7...1.5.........4.8....3..
....2....2.6.....7.....91....1..2.........3....3....81..9..8.5...4.....8.8..9..7.