Version 2.1 adds Thermometer Sudoku:

• 1,600 graded puzzles across four difficulty levels
• Scan Thermometer Sudoku with the camera or photo library
• Edit thermometer paths and correct scan results
• New Thermometer hints, candidate removals, and reasoning explanations
• Switch between Classic, Killer, and Thermometer Sudoku from the home screen

This update also improves scanning, resuming games, bookmarks, scoreboards, localization, and overall stability.