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Sudoku, rebuilt as an arena

Think in colors. Climb the world.

SudoJ4d' gives you the sharpest thinking tool sudoku has ever had — three-color notes — then puts your solve on a world leaderboard that is verified server-side. Free on iPhone, iPad & Android.

Download on theApp Store Get it onGoogle Play

The 3-path note system

Hold three ideas at once.

Every cell carries three note layers — red, yellow, green. Sketch one hypothesis in red, hedge a second in yellow, build your best line in green — several digits per layer, all three living side by side on the same grid.

Then the signature move: Validate. One tap commits every single-digit cell of one color — your whole green line snaps into the grid at once. Wrong turn? Undo restores your notes exactly. Quit mid-think? They're still there when you come back.

Watch the background — the green path is about to commit itself, cell by cell.

Daily ranked

One grid.
The whole world.

Every day, one puzzle per difficulty — medium, hard, expert — and everyone on Earth gets the same one. Two free attempts a day, extra runs at 200 J4D', hints locked. Your best score goes up against the planet: world Top 100, daily, weekly, monthly and all-time.

And the board is clean. Every score is recomputed on the server — minimum solve times, full solution check, no client-side tricks. If a score is on the leaderboard, it was earned.

Base 25,000 → 100,000 by difficulty Time bonus ±50% Flawless +10% Ranked wins pay ×2 J4D'
Daily rankedToday · Expert
1Nova9flawless, no undo0
2KujiKuji3:12 under target0
3M4trixgreen path, one tap0
…World Top 100same grid, one day to shineyou?
Server-verified · resets daily

Private challenges

Six characters.
Total war.

Create a challenge, set the clock — 15 minutes to 7 days — and share the 6-character code. Same puzzle for everyone, fastest time wins, and the prize pool grows with the crowd. Rewards are credited automatically after the challenge closes — no claiming needed.

Up to 5 players1st wins 200 J4D'
6 – 10 players1st wins 500 J4D'
11 – 20 players1st wins 1,000 J4D'
21+ players1st wins 2,000 J4D'
2nd and 3rdpaid too

The jade economy

Show up. Get paid.

One green currency — J4D' — and a calendar that pays it. A monthly Season Pass with one level per day, streak bonuses that stack the longer you stay, quick daily quests, and a referral cut that never expires.

2,000 + 3 tickets — day-30 login, free tier
+5,000 + 5 tickets — VIP stacks on top (9.99/mo)
+20% active-streak bonus on every claim
+1,000 perfect month — every day claimed
up to +50/day all-time streak bonus
10% lifetime commission on friends you refer, + 500 each at signup
The ad policy, in plain words: a full-screen ad may appear after a win — at most one every three games — and never during a solve. Free players also see a small banner while playing. Premium removes all of it. That's the whole policy.

Six worlds

Your grid. Your world.

Six full board themes, straight from the game. Tap one — this entire page re-skins live, exactly like your board does.

Also in the shop: number skins, avatar frames, name styles and titles — common to legendary, all bought with J4D' you earn by playing.

81/81 — SOLVED

Cell 81 of 81

The grid is waiting.

Download on theApp Store Get it onGoogle Play
Free to playiPhone, iPad & Android8 languagesServer-verified scores