GN Math

Fifteen Slide Unblocked

Put fifteen numbered 3D cubes back in order in a 4x4 frame, with moves and time on a scoreboard.

now playing: Fifteen Slide

Fifteen yellow cubes, one empty slot, and a jumbled order to fix. Fifteen Slide unblocked is the old number-sliding puzzle in a square frame, drawn as little 3D blocks you can even tilt for a better look.

Alexander Bazhanov built this version with a move counter, a timer and a scoreboard, so each solve becomes a small challenge to beat.

How to play Fifteen Slide

Press Play. The board gets mixed up during a short count, and the clock starts on GO. Each block you shift raises the counter by one.

Only a block next to the empty slot can move, and it slides straight into the gap. Diagonal moves are not allowed. Click or tap a block to move it, or use the arrow keys to push the block beside the gap.

The puzzle is solved when the rows read 1 to 4, 5 to 8, 9 to 12 and 13 to 15, with the gap last. Type a nickname and your result joins the list of best solves.

Controls

To…KeyboardMouseTouch
Slide a block into the gapArrow keys (the block beside the gap moves in the arrow's direction)Click a block next to the gapTap a block next to the gap
Tilt the board in 3D—Hold the button and drag across the board—
Start a game or open the scoreboard—Click "Play" or "Scores"Tap "Play" or "Scores"
Save a finished resultType a nicknameClick "Save"Tap "Save"
Return to the menu—Click the "Menu" arrowTap the "Menu" arrow

Tips

  • Lock in rows from the top. Build the first row, then the second, and never disturb finished blocks while you work below them.
  • Bring a row's last two blocks in together. Park the final number just below its home, line up its neighbor, then swing both into place.
  • Switch to columns at the end. With two rows left, pair the numbers vertically and fix them left to right.
  • Think in loops. Moving the gap in a small circle cycles three blocks around, which is how you nudge a piece into place without breaking the others.
  • Plan, then slide. Rankings favor a low move count, so a calm solve usually lands higher than a rushed one.

Fifteen Slide questions

Is every shuffle solvable?

Yes. The game shuffles by making random legal slides from a finished board, so it can always be put back.

How are high scores ranked?

By the fewest moves. Your time is shown too. An entry saved with no nickname is listed as Anonymous.

How do I tilt the board?

With a mouse, press and drag over the frame to rotate the view in 3D. It only changes the angle, not the puzzle.

Homework: games like Fifteen Slide

all puzzle games
Black Hole Square game screenshotBlack Hole SquarePuzzleTap arrow tiles to shove squares into black holes and clean a 6x6 board within a tight move limit.Bridges Island Puzzle game screenshotBridges Island PuzzlePuzzleConnect numbered islands with straight bridges until every count matches and the map is one network.Dominosa Domino Logic game screenshotDominosa Domino LogicPuzzlePlace dominoes over a grid of numbers so each pair from a full set appears exactly once.Five-Square Tiling Puzzle game screenshotFive-Square Tiling PuzzlePuzzleFit the twelve five-square shapes into a rectangle with no gaps, using turn, flip and hint tools.Light Switch Grid game screenshotLight Switch GridPuzzleEach press flips a light and its four neighbors. Black out the whole 5x5 board in as few moves as you can.Light Up Lamp Puzzle game screenshotLight Up Lamp PuzzlePuzzleLight every white square with bulbs while keeping lamps out of each other's beams and matching wall numbers.Logic Mines game screenshotLogic MinesPuzzleA mine-finding grid where the board fights back against guesses, so only solid logic gets you through.Loopy Loop Puzzle game screenshotLoopy Loop PuzzlePuzzleTrace one unbroken ring through a dot grid so each numbered cell has exactly that many loop edges.Number Path game screenshotNumber PathPuzzleDraw one line that hits the numbers in order and covers every square of the grid exactly once.Range Shading Puzzle game screenshotRange Shading PuzzlePuzzleBlack out squares so each number counts the right number of visible white squares, with no two blacks touching.