Stack Game Colors vs Sudoku Prime

Simple Stack game but gives you more colors.

Pure logic. Zero ads. Six difficulty levels plus Sudoku X. Sudoku Prime is the cleanest, most complete Sudoku experience on iOS — handcrafted puzzles, a beautiful liquid-glass interface, and every feature a serious solver needs. No ads, no interruptions, no gimmicks. SIX DIFFICULTY LEVELS From relaxing to brain-burning: • Easy — simple techniques, perfect to unwind • Medium — basic patterns and light logic • Hard — advanced techniques required • Expert — complex patterns, real challenge • Master — deep analysis, for experienced solvers • Grandmaster — the ultimate test Every puzzle is rated by the solving techniques required, not just clue count — so the difficulty you pick is the difficulty you get. SUDOKU X MODE Turn on Sudoku X in settings for a fresh twist: both main diagonals must also contain 1–9 without repeats. Diagonals are highlighted subtly on the grid, and hints, notes, and conflict detection all respect the new rules. DAILY CHALLENGE A fresh puzzle every day, the same for every player. Build your streak and compete against yourself — with smart reminders only when you actually need them. BUILT FOR SERIOUS SOLVERS • Auto-fill pencil marks with one tap — toggle on/off • Smart hints with plain-English explanations • Full undo/redo history • Error checking with mistake counter (optional) • Auto-complete when you're almost done • Notes mode with 3×3 pencil mark grid • Cell-first or number-first input — your choice TRACK YOUR PROGRESS • Beautiful statistics dashboard with Swift Charts • Solve-time trends, best times per difficulty • Games distribution by difficulty • 34 achievements across 6 categories • Accurate timer that never drifts when you background the app ICLOUD SYNC Your settings, streaks, achievements, and saved games sync across all your devices automatically. SEVEN BEAUTIFUL THEMES Classic Blue, Colorful, Forest Green, Sunset Orange, Royal Purple, Rose Pink, Ocean Teal. Full dark mode support. DESIGNED FOR IPHONE & IPAD Native SwiftUI interface optimized for every screen size, including iPad landscape. NO ADS. EVER. Sudoku Prime is ad-free forever. Get one free hint every day. Need more? Purchase hint packs only if you want them — everything else is free. WHAT'S IN v1.2 • NEW: Master and Grandmaster difficulty levels • NEW: Sudoku X mode with diagonal constraints • NEW: Auto-fill pencil marks button • NEW: Statistics charts with Swift Charts • NEW: 13 new achievements (34 total) • Improved: Accurate timer using Date tracking • Improved: Technique-based difficulty rating • Many bug fixes and polish Download Sudoku Prime free and discover what Sudoku should feel like.