Decka — Make 10 Card Puzzle

Make ten, clear the board.

Place numbered cards on a 5×5 grid. A row or a column clears when its five cards add up to a multiple of ten. Empty the board to win the level. No gravity — nothing on the board moves unless you move it.

There is never a dead end.

This is the part that makes Decka different, and it is not a marketing line. Every level is generated, then handed to a solver that plays it all the way to an empty board before the level is allowed to ship. The exact deck order you are dealt is certified playable down to the last card. So when a board looks impossible, it isn't. The move exists. Finding it is the game.

What's in it

• 50+ levels across four chapters, and the campaign keeps generating certified boards past level 50.
• A puzzle level every fifth level, where the rule flips: nothing clears, and you fill the whole grid so every row and every column lands on a multiple of ten.
• A daily challenge built from the date — the same board for everyone, with a streak.
• Undo from level one; Shuffle and Wild Card unlock at level 6. All optional: every level is solvable with no tools at all.

No timer. No lives. No account. Think for two seconds or two minutes — the board waits.

Built by one person, in Flutter. The solvability guarantee is enforced by the test suite: two sweeps replay hundreds of generated decks and fail the build if a single one cannot be emptied.

Also on Google Play if you want it on your phone.

https://play.google.com/store/apps/details?id=com.decka.game