BoltTumble Live

Bolt Tumble is classic Sudoku, built for people who actually play it. Every one of the 120 grids is generated and then checked by a solver, so each board has exactly one solution and can always be finished by reasoning — never by guessing. Eight circuits of fifteen grids take you from gentle Spark boards down to Tempest boards with only 26 clues on the table. A fresh Daily Challenge arrives every calendar day, seeded from the date, so everyone plays the same board. WHAT YOU GET • 120 hand-paced grids across eight circuits • Four difficulty tiers: Spark, Surge, Storm and Tempest • A new Daily Challenge every day • Pencil-mark notes with a one-tap notes mode • Unlimited undo and a clean erase • A hint that tells you WHY the digit fits, not just what it is • Live mistake tracking with a per-difficulty allowance • Running timer and a saved best time for every grid • Three-star scoring: finish clean, with no mistakes and no hints, to take all three • Automatic save — leave a grid half-finished and pick it up later ASSISTS, EARNED NOT BOUGHT Clean solves pay out Bolts. Spend them mid-grid on Hint, Scan (flags every wrong digit on the board), Auto-Notes (fills every legal candidate) or Second Wind (hands back two mistakes). There is one currency, it is earned by playing, and there is nothing to buy with real money — no in-app purchases anywhere in the app. SEVEN BOARD SKINS Bolts also unlock board skins that re-paint the grid: Neon Circuit, Marble Hall, Blueprint, Aurora, Tempest and Solar Brass, alongside the house Dusk Lattice board. BUILT TO BE READABLE Highlight the selected cell's row, column and box; turn the timer off if it distracts you; switch on bold digits or high contrast; turn off every ambient animation with one Reduced Motion toggle. Big tap targets, no tiny candidate icons — just crisp digits. COMPLETELY OFFLINE No account. No sign-in. No ads. No analytics. No network calls of any kind — the release build requests no Android permissions at all. Puzzles are generated on your device, so the app works on a plane, on the subway, and anywhere else with no signal. Twelve badges track the long game, from your first solved grid to clearing all 120.