2048 is a game played on a 4x4 grid, with numbered tiles that slide when a player moves them using the four arrow keys. Each turn, a new tile randomly appears in an empty space on the board with a value of 2 or 4. The tiles slide as far as possible in the chosen direction until they are stopped by another tile or the edge of the grid. If two tiles of the same number collide while moving, they will merge into one tile with the total value of the two collided tiles. The resulting tile cannot merge with another tile again in the same move. Tiles with higher scores emit a soft glow, and the highest possible tile is 131,072. If a move causes three consecutive tiles of the same value to slide together, only the two furthest tiles along the direction of movement will combine. If all four spaces in a row or column are filled with tiles of the same value, a parallel move to that row/column will combine the first two and last two tiles. A score counter in the top right keeps track of the user's score. The user's score starts at zero and increases each time two tiles are combined, by the value of the new tile. The game is won when a tile with a value of 2048 appears on the board, hence its name. After reaching 2048, players can continue playing (beyond 2048) to achieve higher scores. When there are no legal moves left for the player (no empty spaces and no adjacent tiles with matching values), the game ends.
"Use your arrow keys to move the tiles. When two tiles with the same number touch, they merge into one."