It depends on what is deemed to be 'logical'. If you need to use temporaries (guess), it is not logical. Having one solution does not guarantee it is logical. However, having more than one solution means it is illogical. In this particular case, the uncertainty arises with R3-5. You can use some 2D logic to determine where the 4 in R3 does not go. But it is a bit of a stretch to say that you can determine further without using temporaries. The contradiction is not immediately obvious and only becomes apparent a few steps later. In my opinion, this means it is not '100% logical'. This is the only site I know that has the option of temporaries. I have found another one which in my opinion has better puzzles (colour ones, larger ones) and there is no temporary option.
Having said that, I would agree that I like this series and much prefer the imagery of these cathedrals to word and pattern ones. So just in case anyone gets upset with any minor criticism, thanks for the puzzle :)
I like the finished pic but I do think that Roba does have a point 100% logical to me means not guessing or temps. Bit disappointed that the other place you use is not listed we all love these.
I think it often adds to the fun to have to use temporaries as long as their use leads to the correct solution and not to 'guessing'. Trying a few different avenues can actually add to the fun. However, doing the puzzles quickly is not my main enjoyment but solving the puzzle itself. Thank you very much for spending your time creating puzzles for our amusement.
Nice result.
Having said that, I would agree that I like this series and much prefer the imagery of these cathedrals to word and pattern ones. So just in case anyone gets upset with any minor criticism, thanks for the puzzle :)