i really like this for killer sudoku! this is the only brute-force killer sudoku solver i have seen that does not require a download, and it's easy to use - and it may be the fastest one i know of

i had a play around with it trying to test the sudokus in

this thread, which are the hardest killer sudokus that i know of based on time to brute-force, and these are the results i got to confirm a unique solution:

Wecoc #1: 19.8 seconds

Wecoc #1 with 3-cell 6-cage in block 5: 74.5 seconds

Wecoc #2: 282 seconds

tarek's unsolvable #41: 219 seconds

mith's

White Room: 0.013 seconds (for comparison)

HATMAN's

14-cage: 0.209 seconds

Wecoc #1 with 3-cell 18-cage in block 5 (invalid): 344 seconds for first 2 solutions

these times are faster than the ones posted in that thread from other solvers, so this may be the fastest killer sudoku solver i know of! i haven't used those other solvers so can't make a direct comparison but this is very impressive - well done

i might check out some of the other variants if i find some nice hard puzzles to test them with

can i suggest that a puzzle should not automatically solve even when partially entered? when i was testing these i had to click "abort" after entering each cage as it would try to solve it every time which was a distraction

you spelt "possibilities" wrong in the drop down menu next to the grid