The object is to fill in the rows and columns with digits 1 to 9 (no duplicates) so that their sum matches the clues. Puzzles have only one solution, and can be solved without resorting to trial and error. Simple to understand, challenging to solve! Features -No ads - ever! -Synchronize your progress across multiple devices -Use your tablet at home; continue on your phone at lunch -True tablet support - landscape or portrait -Three levels 6x6, 8x8, 10x10 -150 puzzles to start -Thousands to download for free! • Statistics Game Play -Enlarge sums on small screens -Pencil marks -Undo/Redo -Copy/Paste/Clear -Pause/play -Reset puzzle Assistance -Highlight duplicates and incorrect sums -Timer and move counter -Highlight rows/column with unique solutions -View possible combinations -Reveal solution -Help and strategy examples Puzzles are from the collection at http://krazydad.com Copyright 2015—2016 and used with permission. Permissions Modify/Read SD Card: Writing error log. Network Access: Download new puzzles. Create/Find Accounts: Synchronization with Google Drive. Sync Settings: Synchronization with Google Drive.