Column Doubles Strategy: Column Planning and Chain Merges

Updated October 2026

Column Doubles is played on a narrow board of five columns and eight rows. You choose a column, a numbered tile falls to the lowest free cell, and equal numbers that touch combine into a single tile worth double. There is no timer and no hurry, so every point you earn comes from planning. This guide explains the exact merge rule, how points are counted, which tiles you will be given, and the habits that keep a board alive for hundreds of drops instead of dozens.

What happens when a tile lands

A tile always drops to the lowest empty cell of the column you tap. The game then looks at the tile that just landed and gathers every tile of the same value connected to it through up, down, left or right neighbours. If that group has at least two tiles, the whole group disappears and one tile of double the value is left at the landing spot. Every column that lost a tile then settles under gravity, and the game checks the settled tiles again for new equal neighbours. Each new match repeats the process, so one drop can set off a chain.

The detail that matters most is that group size does not change the result. Two equal tiles become one tile of double value. Three or four equal tiles also become one tile of double value. A group of three eights gives a single sixteen, exactly like a pair, and the third eight is simply lost. Big groups are not a bonus; they waste material that could have built a bigger number later.

How points are counted

Every merge adds the value of the new tile to your score. Joining two twos into a four is worth 4 points. A chain that goes from eight to sixteen to thirty two in one drop is worth 16 plus 32, or 48 points. Dropping a tile without a merge is worth nothing.

That gives two simple rules. Higher values are worth far more than many small merges, and long chains add up quickly because each step pays the full value of the tile it produces. A board that grows a single large tile and feeds it steadily scores much more than a board that keeps making fours.

Which tiles you will be given

The box labelled Next shows the tile you are about to drop. It does not show the one after that, so your planning horizon is one known tile plus the general odds. Those odds depend on your score:

• Below 100 points, only twos and fours appear, with twos about seven times in ten.
• From 100 points, eights join the mix.
• From 500, sixteens; from 1,500, thirty twos; and from 4,000, sixty fours.
• After that the cap keeps doubling each time the threshold grows two and a half times: 128 from 10,000 points, 256 from 25,000, 512 from 62,500, with no upper limit.

Small values always stay the most common. Once sixty fours are unlocked, twos still make up a little over half of all new tiles, fours about a quarter, eights about one in ten, and sixteens, thirty twos and sixty fours about one in twenty each. Plan for twos, and treat the large spawns as awkward guests that need a home.

Stones, full columns and how a run ends

From the 150th drop onward, some new tiles are grey stones marked with a diamond, and the Next box shows a diamond when one is coming. A stone never merges with anything, not even another stone. It breaks only when a merge happens in a cell right next to it, above, below, left or right, and then the tiles above it settle as usual. Stones are rare at first, about one tile in twelve by the 300th drop and one in five by the 600th, and they keep getting more common the longer you play: roughly one in three by the 1,000th drop and more than half after 2,000. Every run therefore ends sooner or later, however tidy the board.

Tapping a column that is already full does nothing; the column flashes red and you simply choose another. Taps in the margin beside the board are ignored too. The game ends only when all five top cells are filled, so no column can take another tile. Treat a full column as closed and plan where your next stone can go, ideally beside a pair that is about to merge so the merge breaks it straight away.

Building a board that lasts

The strongest structure is a column, or a corner, where values increase steadily toward the bottom, with the largest tile at the base. A new tile dropped on top of an equal tile merges straight down, the doubled tile settles one cell lower, and if it now matches the tile beneath it the chain continues. This vertical ladder is the cleanest way to create chains, because each step is predictable.

• Reserve a dumping column. Keep one column for small tiles that do not fit anywhere. Twos and fours stacked there merge with each other often, which keeps it short.
• Avoid burying small tiles. A two sitting under a sixteen cannot be reached again until the sixteen is gone. Every buried small tile is a cell you lose for a long time.
• Watch side neighbours. Merges also happen sideways, so a tile can join a group in the next column. Before dropping, check the cells to the left and right of the landing spot, not just the one below.
• Prefer pairs to groups. Because a group of three only produces one doubled tile, try not to let three equal tiles touch at the moment of a merge.

Reading the board one drop ahead

Since you only know the tile in your hand, the best habit is a quick check of all five columns before each tap. For each column ask three things: where will the tile land, will it merge, and what will the board look like after any chain settles. A drop that merges is usually better than one that does not, and a drop that lowers the tallest column is better than one that raises it.

To show how much this matters, we ran two simple strategies using the game's own merge, spawn and stone rules. In our simulation, tapping random open columns reached a median of about 2,700 points over roughly 280 drops. A strategy that only checked the result of the current drop, preferring fewer tiles on the board and larger tiles below smaller ones, reached a median of about 27,000 points over roughly 860 drops before the stones closed the board. That is a gap of about ten times between careless and careful play, with no extra skill beyond checking each column before tapping.

Common mistakes

The usual early mistake is spreading tiles evenly across all five columns. It feels safe, but it leaves many lonely small tiles with no partner. Another is chasing a merge in a tall column and filling it to the top, which leaves one column fewer for the next stone. A third is ignoring sideways neighbours, so a planned vertical chain is spoiled by a tile in the next column joining the group. Slow down, scan every column, and keep at least two columns low at all times.

Your best score is saved on your device, and any score above zero can be sent to the Hall of Fame from the Game over card.