Sudoku not challenging enough? Tease your brain with Jigoku, a Sudoku variant where notches in the cell borders, known as jigs, show the greater-than / less-than relationships between cells. This app is inspired by the incredibly fun and tough puzzles made by Jim Bumgardner (see: https://krazydad.com/jigoku). Minimalist Gameplay and Design • Enjoy simple, lightweight colors and backdrops as you focus on completing your puzzles. • Quickly and effectively solve the hardest of puzzles with simple to learn gestures and features. • Remove clutter by using a blank backdrop and hiding words from the interface. Enter Guesses, See Highlighted Contradictions, and Undo Moves • You can highlight guesses and placed values, enter guesses quickly with a tap or slide of the finger, and enter final values with a long press. • Duplicates and guesses that conflict with final value selections are highlighted, and can be quickly deleted with a single button. • Any action can be undone and redone while playing. Generate Unlimited Games • The puzzle generation system will let you create as many puzzles as you want. • Support for both Sudoku and Jigoku games, 2x2 and 3x3 games, and varying levels of difficulty. • Each game has a guaranteed solution. Challenge Mode • Melt your brain ever further with almost over a 100 puzzles from Krazydad.com with a range of different difficulties. • Pro Tip: for the hardest puzzles, double-tapping to highlight cells can be useful for doing guess-and-check (namely, highlight cells where you guessed the value). In addition, there is a button in the drop-down menu for clearing the guesses you placed while doing guess-and-check. Animated Tutorials • Learn the rules of Jigoku and how to interact with the interface with step-by-step visuals. • Look for a "(?)" in the interface to get a quick lesson. Multiple Active Games and Stats • Have as many concurrent games saved as you'd like and delete them whenever. • View the number of games you've completed, your most recently completed games, and your best times for completing different games. Colors! Themes! • Select any of the 5 colored themes or their midnight (color-inverted) counterparts. • Choose wallpaper themes to your heart's content (or none at all). Enjoy! Credits: The Krazydad puzzles available in this app are sourced from Krazydad.com (Jim Bumgardner), are copyright 2006, Jim Bumgardner, and used by permission. Big thanks to Heleni Ramirez for providing the Spanish translation for the App!