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Product Review
- * 4 difficulty levels
- * 3 input modes: "Digit first", "Cell first", popup
- * Pencil marks (a.k.a. Notes) with auto fill / erase option
- * Selected digit and various other highlighting options
- * Show digit counts option
- * Auto-save together with Unlimited Undo and Redo
- * Intelligent hints that use only logic
- * Two levels of automatic error checking option
- * Submit results and track progress online
- * Real time competitions
