N vs Sudoku Sublime

Dual N-Back is a scientifically-backed cognitive training game designed to strengthen your working memory and fluid intelligence. First introduced by Wayne Kirchner in 1958 and popularized by Susanne Jaeggi's landmark 2003 research, the N-back task remains one of the most studied tools in cognitive neuroscience. Each round, you're shown a sequence of positions on a grid and hear a sequence of spoken letters. Your goal: identify when either the position or the letter matches what appeared N steps earlier. As your accuracy improves, the game advances your N-level — pushing you further. Game Modes: Dual N-Back lets you track both auditory and visual stimuli simultaneously — the most challenging and most studied mode. Single N-Back focuses on one stimulus type at a time, great for getting started or isolating a weakness. Silent Dual N-Back is visual-only, ideal for quiet environments. Adaptive difficulty adjusts your N-level based on performance. Score history lets you track progress over time. Light and dark mode included. Clean, distraction-free interface built for focus. No ads. No subscriptions. No nonsense. Whether you're a student, professional, or just someone who wants to stay sharp, Dual N-Back gives you a rigorous, research-grounded workout for your mind.

Finally. Sudoku without the spam. No ads interrupting your flow. No pop-ups begging for subscriptions. No coins, no lives, no tricks. Just you and the puzzle. Pure Sudoku. Nothing else. We built the Sudoku app we wished existed: clean, beautiful and completely free. Solve thoughtfully designed puzzles at your own pace, track your personal bests and enjoy a calm, focused experience that works even offline. WHAT YOU GET • Two grid sizes: Classic 9×9 and Mini 6×6 for shorter sittings • A beautiful, distraction-free interface • Five difficulty levels, from Beginner to Expert • Puzzles with a single unique solution • Personal records and local leaderboards • Optional hints when you need them (no pressure) • Toggleable error highlighting and mistake tracking • Dark mode and subtle haptic feedback No ads. No tracking. No internet required. Remember what Sudoku is supposed to feel like.