Dirama

Goal

The board starts completely full. Clear every tile to win — merge into bigger numbers, then break full lines back down.
Since there's no empty cell to start, your very first move is always a merge.
The bar under your score tracks how much of the board you've cleared.
If the board shrinks as you play (empty rows and columns fall away), shrinking it all the way down to a single cell also wins the game — you don't have to reach zero tiles.

Each turn you're offered 3 numbers (almost always primes, with the occasional 1) — pick one and drag it onto any board cell.
The other two are discarded and replaced along with the one you played.
Empty cell: it's placed as-is. Occupied cell: if the colors or values match, the two values add together — that's the only way to build bigger numbers. No match, no merge.
1 is always a wildcard, and any other number has a small chance of being one too — a wildcard can always be placed on any tile, no matter its color or value. Look for the pulsating gold ring on a candidate.

Placing a tile can only clear the row and column you just placed into, and only when that row/column is completely full, every value unique, and one of them must divide evenly into all the rest.
That number stays exactly where it is — every other tile in the line disappears.
Nothing else on the board is ever touched — no chain reactions. Only your own placement ever clears a line.
Clear both a row and a column at once for a Cross Trigger bonus.

The starting board can already include any prime the game uses, up to 13 — some boards open with a big prime already in play.
The numbers offered each turn start conservative — just 2s and 3s — and bigger primes (5, 7, 11, 13) unlock the more lines you clear.