Solidoku: Sudoku Solitaire

Now with DAILY CHALLENGES — three fresh puzzles every day!

Solidoku shuffles two timeless games into something new: a sudoku board, played with a deck of cards.

Every empty cell on the board is a card waiting to be played. Draw from the deck, match the card's suit to its section of the board, and work out the one cell where its number belongs. Fill the board to win — but think before you tap, because wrong moves cost points.

HOW IT PLAYS • Each 3×3 box belongs to a card suit — hearts, clubs, or spades • Draw a card and every open cell of its suit lights up • Use classic sudoku logic to find the number's one true home • Place every card to complete the board

DAILY CHALLENGES — NEW IN 2.0 • Three dailies a day — Easy, Medium, and Hard — the same puzzles for every player, generated right on your device • Complete every day of a month for a gold trophy — or back-play missed days from the calendar and claim silver • An optional daily reminder keeps your streak safe, and it's smart enough to stay quiet once you've already played • Share your result — time, mistakes, hints, and streak — with one tap

YOUR GAME, YOUR PACE • Three difficulties, from a relaxed Easy to a properly tricky Hard • Zen Mode: no score, no clock, no pressure — just the puzzle • Stuck? A hint reveals exactly where the current card belongs — three per game, unlimited in Zen • Purist? The Hide Suit Hints toggle turns off the suit glow for a tougher solve • Optional mistake limit: play loose with unlimited tries, or set a 3, 5, or 7-strike cap when you want real stakes • Score chasing: faster placements earn more, mistakes cost you, and yes — your score can go negative. Win anyway and wear it with pride. • Leave anytime: your game saves automatically and resumes where you left off

COLLECT & COMPETE • Unlock 39 collectible card back designs by playing your way — perfect games, zen wins, comebacks, speed records, and a few surprises • Game Center achievements track your progress on every unlock • Per-difficulty statistics — win rate, fastest times, and high scores — plus a Dailies tab for streaks, records, and monthly trophies • iCloud sync carries your stats, streaks, trophies, and unlocks to every device you own

MADE FOR IPHONE • Clean, native design with full light and dark mode support • A built-in tutorial that teaches real sudoku logic from scratch — then Solidoku's card-game twists • Works completely offline — perfect for flights and commutes (yes, even the daily puzzles) • Quick sessions: a game fits in a coffee break

Solidoku is free to play with ads. A one-time In-App Purchase removes them forever, anytime.

Draw a card. Find its home. Fill the board. Come back tomorrow.