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Classic sliding-block puzzle, also known as Huarong Pass. Slide the blocks around to free the big 2×2 block and move it out through the exit at the bottom. Aim to solve it in as few moves as possible.
The 4×5 board starts in the classic layout: the big red 2×2 block at the top centre, four tall 1×2 blocks standing in the side columns, one wide 1×2 block directly beneath the big block, and four single squares, with the only two empty cells at the bottom centre. Blocks can only move into empty space.
Drag a block up, down, left or right. The length of your drag sets how far it goes: about one cell's length slides it one cell, about two cells' length slides it two, and a drag shorter than half a cell does nothing. A block stops early if something is in the way. There is no rotating and no lifting blocks over one another — everything slides flat, like tiles on a tray.
Your goal is the big 2×2 block. Work the other pieces out of its way until it sits on the dashed exit at the bottom centre. The moment it lands there, the puzzle is solved.
Every slide counts as one move, whether the block travels one cell or two, and your move total is your score — lower is better. There is no undo and no clock: moving a block back costs another move, but taking your time costs nothing. When you solve it you can save your move count to the Hall of Fame (the 10 lowest), and your best is kept in this browser. Tap New to reset the board and try for a smaller number.
Think about the two empty squares, not the blocks. Every move is really a move of the empty space, and you can only do anything where a gap sits next to a piece. Steering the gaps to where you need them is the whole game.
The small single squares are your tools. They are the most mobile pieces and the easiest way to shuffle empty space from one side of the board to the other, so use them to ferry gaps around rather than letting them clog a corner.
Don't lunge for the exit too early. The big block can only descend once both columns beneath it are clear, which usually means parking the wide and tall blocks off to the sides first. Set up the escape lane before you commit the 2×2 downward.
For a better score, plan a few moves ahead and avoid undoing yourself — sliding a piece out and straight back is two wasted moves. With this game's counting, where each straight slide is one move, the shortest possible solution of the classic layout is 90 moves (it would be 81 if a piece could turn a corner within a single move, and 116 if every one-cell step counted). So there is plenty of room to keep beating your best.
Accept that the big block must step aside. It cannot simply sink straight down: the wide block starts directly beneath it and has to finish above it, and two pieces that are each two cells wide can only pass one another when the big block is shifted into the left or right pair of columns. Every solution therefore moves the big block sideways at least once, so plan the detour rather than fight it. In every 90-move solution the big block moves exactly nine times, the first time on move 29 — all 28 moves before that rearrange the other pieces.
Make every drag count. A two-cell slide is a single move, but covering the same distance with two short drags costs two, and every 90-move solution contains exactly 28 two-cell slides. So when a block has a straight run of two empty cells ahead of it, drag it the full distance in one go — overshooting is harmless, because a block stops at the first obstacle. The layout is mirror-symmetric, so it does not matter which side you start clearing: every solution that begins on the left has a mirror twin of exactly the same length that begins on the right.