Straight Sudoku app for iPhone and iPad

Billions of unique puzzles created from scratch in real time.
Game levels between 17 - 80. Each level corresponds to the number of given numbers (clues). Game levels 17 -26 with four additional choices, "Easier", "Easy", "Hard" and "Harder".
Local Challenge. Play the same game against peers in real time.
Undo/Redo.
Hints.
Check for incorrect input.
Path tracking/subnotes on cell input.
Save and reload puzzles.
Autosave on Exit.
View/Reset statistics for each gaming level.
Normal games, random games and
games with cross-diagonal solutions, 9 rows by 9 columns + 2 diagonal.
All non-Random games are one solution games.
Support for iPad keyboards - Magic & Smart and external Magic keyboards.Most functions can now be performed with keyboard input.
Keep the input keypad visible during the game.