@szczor if all methods fail you need to use contradictions to tell you what isn't in order to tell you what is, thus all puzzles (emphasis) are solvable in this matter, essentially logically and without hints. Therefore, your statement, which is a garbled mess, is flat-out wrong.
The game shouldn't tell you if you have a column/row wrong via the green/red arrowheads... They should only indicate whether or not the whether your proposed set-up satisfies the conditions of that row. This is game breaking, assuming you wish to do the puzzles legitimately.
To be fair this would have been removed with or without SOPA, assuming it was uncensored, in the first place... This is just an attempt for the dev to make a couple bucks off of a really shitty mario rip-off.