Sudaku - Pattern-driven sudoku

Find a pattern, let your logic ripple across the grid, and focus on your next insight. Sudaku is your tireless sudoku workhorse - it handles all the grunt work while you do the thinking. Spot something? It fills in every obvious consequence. Express patterns using constraints like alldifferent, one-of, and value elimination. Your rules, your strategy, your glory. 9×9 and 16×16 puzzles included.

## changes

* new app icon design
* added Trophy Room with achievements and puzzle history
* difficulty levels: Easy, Medium, Hard, Expert, Extreme
* live difficulty indicator shows puzzle complexity as you solve
* puzzle import/export using dot notation
* puzzle state persistence - resume where you left off
* fixed dead-end detection in constraint solver
* improved layout