World's most evil Sudoku

A Finnish mathematician has claimed he has created the world's hardest sudoku puzzle, a brain-teaser that required three months' work and a billion combinations to produce. "AI Escargot is the most difficult sudoku puzzle known so far," the puzzle's 37-year-old creator and applied mathematician Arto Inkala said. "I called the puzzle AI Escargot, because it looks like a snail. Solving it is like an intellectual culinary pleasure. AI are my initials," Inkala added. According to a rating published on a sudoku website, AI Escargot claims the top spot for sudoku's most baffling puzzles. Escargot demands those tackling it to consider eight casual relationships simultaneously while the most complicated variants attempted by the general public only require people to think of one or two combinations at any one time, Inkala said.