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The elegant sliding-number puzzle that started the whole genre. Swipe and every tile shuffles one step in that direction. A 1 and a 2 are shy on their own but join into a 3; after that, matching numbers double up — two 3s make a 6, two 6s a 12, and on up the chain. The twist that keeps you thinking is that you always see the next tile waiting to drop in, so every swipe is a small plan, not a reflex. Tidy the board, set up your big merges, and chase the highest tile you can before the grid jams solid.
The board is a 4×4 grid that starts with nine tiles already on it. Swipe up, down, left or right — or use the arrow keys — to slide. Unlike most sliding games, tiles do not race to the far wall: they move exactly one cell in the direction you swipe, if something can receive them.
Merging follows one simple rule set. A 1 and a 2 sitting next to each other in the swipe direction combine into a 3. From there, only equal numbers combine, each into their double: 3 and 3 become 6, 6 and 6 become 12, 12 and 12 become 24, and so on. A 1 will never merge with another 1, and a 2 never with another 2 — they only pair with each other.
Every time the board actually moves, one new tile slides in along the edge you swiped from, and its value is the one shown in the 'Next' preview at the top. Because you can see what is coming, you can steer it toward where you want it.
Your score comes from the tiles on the board — bigger tiles are worth far more than the sum of their parts, so a single high tile beats a board full of small ones. Keep making room and combining upward. The game ends when no swipe in any direction would move a single tile, and your final score is locked in.
Pick a corner and stay disciplined. Most strong players keep building their largest tile in one corner and feed smaller tiles toward it, swiping mostly along two directions. Flailing in all four directions scatters your big tiles and clogs the board fast.
Use the Next preview every single turn. The tile waiting at the top tells you which edge your new tile will arrive on, so swipe in the direction that drops it where it helps — filling a gap or lining up a future merge — rather than where it blocks you.
Keep 1s and 2s under control. They only ever combine with each other, so a 1 stuck next to a wall of 6s is dead weight. Pair them off into 3s promptly, and try not to let stray 1s and 2s pile up where they can't meet their partner.
Don't swipe just because you can. A move that only nudges the board without setting up a merge often does more harm than good, jamming tiles together in the wrong order. If a direction wrecks your corner, take a different one — and sometimes the patient move is the one that combines two mediums into a new biggest tile.