I fear the numbers are against you. There are only 288 valid 4x4 sudoku solutions, most of which are just permuting the numbers or row/column swaps. There are precisely two combinatorially distinct solutions.
I freely admit to not solving the puzzles in the link above. It's simply a waste of time. You could spend several hours doing trial and error and get nowhere with them. You aren't going to spend too much time taking the same approach to a 4x4 grid!
Sorry Lajo - your ramblings here are irritating at best. If you have something to show us, show it. If not, please go elsewhere. Nothing you have said so far is of any interest to anyone here, and I am hovering over 'delete account & posts' beside your name...
If you have a new puzzle concept then explain the rules and we can judge it fairly to give you an indication as to whether your claim is anywhere near true. Telling us you have a concept without describing it, or even showing an example merely irritates as PuzzleScot has correctly stated. Based on the limited information you have given (which in itself is contradictory: world's hardest = child's play?!) detuned is also correct in stating your claim is VERY unlikely.
In short, come back when you have something to offer us - in the meantime, your time spent posting here could be better spent writing correct code so you don't need as long debugging it.
Everything I've read so far sounds like a standard sudoku app written by non-sudoku players. There's been two further ramblings since the first warning. We all have better things to spend our time doing. If it's world-changing we can find out after it's released...?
what thorough nonsense. The idea that anyone can lay claim to a set of rules to a puzzle is nonsense and stupidity of the very highest order. If you disagree, tell me why no-one owns the rights to the rules of sudoku?
The only intellectual property at stake is your app, which no-one can see until you release it; and the name you have given to it, which you have already released. Even then, laying trademarks against the name of your puzzle is almost certainly counter-productive. Nikoli trademark Sudoku in Japan, where everyone else just calls it Nanpure. Imagine how much difficulty you'd have in marketing your app if "sudoku" had dozens of proprietary names...