Abyss Sudoku
Challenge the depths of logic.
Uses DDAP Sigil
Abyss Sudoku is classic Sudoku, done carefully. Every puzzle has exactly one solution and can be solved by logic alone, never by guessing.
Each one is graded by the solving techniques it actually needs, so Easy feels easy and Master earns its name. Now for iPhone, iPad and Android.
Features
Five Levels
Easy, Medium, Hard, Expert and Master, from first puzzle to the hardest logic. A fresh puzzle every time you start a game. Easy is relaxed and untimed; the clock comes in from Medium up.
A New Daily Challenge
One new puzzle every day at midnight, the same puzzle for everyone. Build a daily streak and see how your time ranks against today's players.
Help That Teaches
Pencil-mark notes, unlimited undo and an eraser. Hints point out a wrong digit, or name the technique that unlocks your next move, so you learn as you play. Wrong digits can show in red, or switch that off for a purer game.
Leaderboards and Friends
Today's Daily, Fastest time for each level, Puzzles Solved, Dailies and Best Streak, with your friends first, then everyone. Add friends by code; they show up in every Deep Dark Abyss game. Your DDAP Sigil is an anonymous player identity: a gamertag you choose, no email or password. Leaderboards are optional; the game plays fully offline without them.
Your Progress
21 achievements to earn. Stats for puzzles solved, streaks, a personal best for each level, and your total and average time. Optional reminders when today's Daily Challenge is still waiting.
For Phones and Tablets
A big, clear board on tablets, in portrait or landscape. Your game saves as you play, so you can pick up where you left off.
Screenshots
Phone
Tablet
Privacy
Your progress is stored on your device. Leaderboards and friends are optional and use an anonymous DDAP Sigil: a random ID, the gamertag you choose, and your game results. No name, email, phone number or location is collected. Data is never sold, never used for advertising, and never used to track you, and you can delete your Sigil and all of its data from inside the app at any time. Read the full privacy policy.
Join the Abyss Sudoku Beta
Abyss Sudoku is in private beta for iPhone, iPad, and Android phones and tablets. Testing is by invitation: tap Request Beta Access below and fill in the short form in the email: your device, operating system and version, and the Apple ID or Google account you use with the App Store or Google Play. Test invitations are tied to that account, so please use the one on your device.
Abyss Sudoku is free, with no ads. No account is needed to play.