How to play Merge
You have a 5×5 grid, 25 cells in total, and one tile waiting in the NOW slot. Tap any empty cell to drop that tile there. Unlike a sliding puzzle, nothing moves on its own: the tile lands exactly where you put it and stays there.
When three or more tiles of the same tier end up touching each other side by side — up, down, left or right, never diagonally — they immediately fuse into a single tile one tier higher, and that new tile appears on the cell you just played. The NEXT slot shows what is coming after the current tile, so you can plan two drops ahead.
On a keyboard, the arrow keys move a cursor around the grid and Enter drops the tile. U undoes, R restarts the same board, and N starts a new one. On a phone, a single tap on the cell is the whole control scheme.
The upgrade chain
There are six tiers, and each one looks different in three ways at once — shape, colour and symbol — so neighbouring tiers never blur together at small sizes:
Spark (small dark circle) → Node (teal square) → Core (blue hexagon) → Prism (purple diamond) → Nova (orange star) → Singularity (green ring).
New tiles arriving in the queue are only ever Sparks or Nodes, so everything above that has to be built. Because three tiles make one, the arithmetic is steep: a Prism is worth 27 Sparks, and a Singularity is 243 of them.
A Singularity is the top of the chain and never merges again. That is the most important rule in the game and it is not a reward — it is a permanent occupant. It will sit on that cell for the rest of the run, and you cannot remove it. Climbing the chain costs you board space forever, which is why a high score and a crowded grid are the same thing.
Stones, and the only way to clear them
Every fourteenth tile the queue hands you is a Stone: a grey, hatched block with no colour of its own. Stones never merge with anything and cannot be dropped on or moved. They are deliberately on a fixed cycle rather than random, so you can count them coming and decide where to park them.
The one way to remove a Stone is a shatter charge, and you earn a charge by fusing a Prism or better. When you have at least one charge, stones on the board light up amber and tapping one clears it, freeing the cell and scoring 4 points. Shattering does not consume the tile in your NOW slot — it is a maintenance move, not a drop.
That exchange rate is the engine of the whole game. Building one Prism costs 27 drops of Spark-level material and earns you exactly one charge, while the queue hands out a stone every 14 drops. Over a long run stones therefore arrive close to twice as fast as charges do, no matter how well you play — and each charge clears only one stone.
There is no winning, only running out of room
This game has no win screen, no final level and no completion state. The only way a run ends is that every cell is occupied and the next tile has nowhere to go.
That is a deliberate design choice rather than an omission. Because stones and Singularities accumulate faster than they can be removed, the board tightens on its own, and the score measures how far you got before it closed. A grid that could always be cleared would have no ceiling, and a score with no ceiling is not really a score.
The board is not necessarily dead just because it is full, though: if a stone is still on it and you have a shatter charge saved, you can break the stone and keep going. Saving a charge for exactly that moment is the difference between a good run and a short one.
The game tells you when you are in trouble
In a balance test of forty runs, a player making purely random legal moves jammed the board in all forty, usually within the first fifteen seconds. Random play fills the grid with scattered low tiers that can never reach three of a kind. A strong strategy also ended in a jam all forty times — that is what happens when there is no win condition — but it scored several times higher first.
Because a tightening board looks the same as a player's own mistake, the line under the grid says what is happening: it warns you when you are down to your last few cells, and it tells you when stones are stranded on the board with no charge available to clear them. When the run finally ends it says so plainly rather than leaving you to work it out.
Undo covers your last 200 moves and rolls back the board, the score and the drop counter together, so an undone move leaves no trace in your score. Undo also works after a run has ended, which means a jam is recoverable if you want to try that last drop again. Restart replays the same board from the beginning; New board deals a fresh one.
Scoring
Your score comes only from fusing tiles, never from how long you take. There is no timer, and sitting and thinking costs you nothing at all.
Each fusion pays according to the tier it produces: 6 for a Node, 24 for a Core, 96 for a Prism, 384 for a Nova and 1,536 for a Singularity. Clearing a stone pays 4.
Chains pay more. If one drop causes a fusion that immediately triggers another, the second step is worth double and the third triple, so a drop that sets off a two-step chain into a Core scores 6 plus 48 rather than 6 plus 24. Setting up chains, not just merging when you can, is where the points actually are. Your best score is saved in your browser on the device where you play; there is no account and no ranking.
How this differs from 2048
Both games fuse matching tiles, and that is where the similarity stops. In 2048 you swipe a direction and the entire grid slides, two matching tiles merge on contact, and you never choose where anything lands. Here nothing slides at all: you pick the exact cell, three tiles are needed instead of two, stones arrive that cannot be merged at any price, and finished tiles stay on the board as dead weight. It is a game about planning space, not about picking a direction.
Device support
Merge works in a desktop browser and on phones and tablets. Measured on a 390-pixel-wide phone, each of the 25 cells renders 60 pixels square — comfortably above the 44-pixel minimum for a touch target — and animations switch off when your system asks for reduced motion. It is self-contained, with no download, account, or third-party runtime.
