Sumfold: Calm Number Puzzle

Merge. Grow. Relax. Repeat. Sumfold is a quiet sliding-number puzzle. Swipe to bring matching numbers together, build larger tiles, and see how far a few thoughtful moves can take you. There is no timer, no pressure and nothing to buy — just you and the board. PLAY YOUR WAY • Classic 4 × 4, or more room on 5 × 5, 6 × 6, 7 × 7 and 8 × 8 boards • Choose your own goal: 512, 1024, 2048, 4096, or Endless — with a slim progress bar toward it • Reach it, celebrate, then keep going as far as you like • Every grid remembers its own game, so you can switch sizes and pick up where you left off • Undo up to ten moves when you change your mind • Ask for a Hint when you are stuck — a gentle nudge, never an answer sheet • Calm mode hides score, best and progress so only the board remains • A short, optional lesson shows how tiles merge MAKE IT YOURS • Six themes: soft pastel Classic, Coastal, Sunset and Sage, plus dark Night Garden and Midnight Ink • Six backgrounds, with an adjustable blur on Android 12 and newer • Follow your device's light and dark mode, switch by time of day, or pick a theme yourself • Adjust tile spacing and corners, swipe sensitivity, haptics and animation • Optional sound effects in three styles and a calm background loop, each with a volume control — both off until you switch them on • Reduced-animation mode and readable numbers in every theme YOUR PROGRESS • Your game saves automatically, so you can stop and continue any time • A Stats page with recent games, milestones, time spent, win streaks and separate personal bests for every grid size • Share a picture of your finished board — made on your device, sent only where you choose QUIET BY DESIGN • No ads. No accounts. No analytics. No purchases. • Works completely offline — your game and settings stay on your device • Smooth, gentle animations that keep the game calm Sumfold is made by Sabaloka.