Decka is a number puzzle that plays like a card game — and solves like a
logic riddle.

You hold a hand of five numbered cards. Place them on a 5×5 grid. When a
whole row or column adds up to a multiple of 10, the cards clear. Empty the
board to win the level.

Dressed in green baize, ivory cards and gold trim — a premium card-table
look. No stakes, no luck mechanics, no pressure. Just your hand, the board,
and the numbers.

-- WHAT'S WAITING --

50+ levels, every one provably solvable. Each Decka level is checked by a
solver before it reaches you. You will never face a dead end. Every deal has
a solution — finding it is the game.

PUZZLE levels every 5th level. The rule flips: nothing clears — fill the
whole grid so every row AND column is a multiple of ten. A different logic
muscle.

Daily Challenge. A fresh puzzle every day, the same for everyone. You get
exactly the cards you need — placing them all is up to you. No draws, no
aids, no hints. Pure logic, and a streak to keep alive.

Daily Bonus. Come back every day for a free reward. No strings attached.

Three strategic aids, unlocked after the tutorial:
- Undo: take back your last moves.
- Shuffle: return your hand to the deck and redraw.
- Wild Card: summon a bonus card and name its digit yourself.
Every aid is paid for with rewards you earn by playing well.

Six languages. English, French, Spanish, German, Italian, Portuguese —
auto-detected, switchable anytime.

NO ADS. NO IN-APP PURCHASES. NO ACCOUNT. Decka runs fully offline and
collects no data. The complete game, free.

-- THE ONE THING TO REMEMBER --

If you think you're stuck, remember: every level is provably solvable. The
solution exists. Finding it is the game.

Your move.