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7×7 Calcudocu noop http://www.calcudoku.org/forum/viewtopic.php?f=16&t=656 
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Author:  nicow [ Sat Jan 17, 2015 8:10 pm ] 
Post subject:  7×7 Calcudocu noop 
But see the nicer looking version of Patrick! This nooppuzzle is not 1 to 7. 
Author:  firefly [ Sat Jan 17, 2015 9:44 pm ] 
Post subject:  Re: 7×7 Calcudocu noop 
It's not just missing the operator on the cage, it's missing the number itself. Edit: Oh, lol, I guess those are supposed to be the cage numbers, nm. Edit: Solved. That was interesting. A somewhat different take on the 2 to 2 5x5 puzzle. Edit: Hrm, wait, one error.. 
Author:  pnm [ Sat Jan 17, 2015 10:33 pm ] 
Post subject:  Re: 7×7 Calcudocu noop 
Thanks nicow Here's the same puzzle after running it through my "visualizer": 
Author:  firefly [ Sat Jan 17, 2015 10:42 pm ] 
Post subject:  Re: 7×7 Calcudocu noop 
Okay, solved for real this time. Had to do the whole thing over again, the error was at the very end, of course >.< 
Author:  kozibrada [ Wed Feb 11, 2015 4:48 am ] 
Post subject:  Re: 7×7 Calcudocu noop 
Thanks for this good puzzle. ► A little spoiler! ◄ After I noticed that all numbers are determined (I didn’t expect that all three “right” single cages are different from those on “left” ), and solved the puzzle, I tried to use subtraction at the negatively marked cages. Of course, I knew and know that this is “forbidden” act for us, puzzlers, but I just tried it – for fun. E.g. the right bottom “5−” cage could have three combinations: −2 + (−3) as addition; −2 − (+3) and −3 − (+2) as subtraction. Though, the puzzle would have only solution… 
Author:  nicow [ Wed Feb 11, 2015 2:38 pm ] 
Post subject:  Re: 7×7 Calcudocu noop 
Thank you Kozibrada! I almost began to think noone had interest in this new kind of puzzle! And you would be right if the cage {F7,G7} is 5. Then the puzzle indeed is incorrect. With 5 it has only one solution! 
Author:  kozibrada [ Wed Feb 11, 2015 10:07 pm ] 
Post subject:  Re: 7×7 Calcudocu noop 
nicow wrote: Thank you Kozibrada! I almost began to think noone had interest in this new kind of puzzle! And you would be right if the cage {F7,G7} is 5. Then the puzzle indeed is incorrect. With 5 it has only one solution! I’m sorry, I thought “−5” cage, of course. I noticed something else, and it could be a useful tip for potential noop (and not only for “negative”! ) puzzles. Your one contains only 2cell cages, so it would mean in practice (if we omit the rule about forbidden negative result at subtraction) that −n− = n−… e.g. −2 − (+2) = +2 − (−2) = 4. But it same doesn’t always apply to “more”cell cages. I’ve chosen 3cell Lshape in 3×3 noop calcudoku with [−1, 0, 1]. In the sketch, except valid combinations, the last combination shows a possible result +1−, not −1−. So here −n− ≠ n−… 
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