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.