How to play Packing Puzzles

Every game is played by getting shapes onto the board — most of the time you just drag a piece from the tray and drop it where you want it. The board, the tray, and an on-screen control pad work the same way with a mouse, a finger, or a stylus. Keyboard shortcuts are available on desktop but never required.

Common controls

• Drag and drop: Press a tray piece and drag it onto the board. A preview shows where it will land; release to place it.
• Tap to place: In the placing games you can also tap a tray piece to arm it, then tap a board cell to drop it there.
• Control pad: The arrow pad in the corner mirrors the keyboard — rotate, move, slide, or drop without touching the keys.
• Undo / Reset: Most games have an undo button; the reset button starts a fresh board (labelled Clear or New game depending on the game).
• Handedness: The hand toggle in the header moves the panel and the control pad to the left or right side, whichever suits you.

Polyomino Fill and Mosaic

Drop every piece so the board is solid with no gaps or overlaps.

• Place: Drag a piece from the tray onto the board, or tap the piece then a board cell.
• Rotate: Use the rotate buttons on the pad, the mouse wheel over the board, or the R key (Shift+R rotates the other way).
• Nudge: Select a placed piece and use the pad arrows or the arrow keys to shift it one cell.
• Remove a piece: Double-tap (or double-click) a placed piece to take it off the board. You can also select it and press Delete, use the trash button, or simply drag it off the board — it returns to the tray.
• Hint / Solve: The engine can place one more piece for you, or finish the whole board.
• Mosaic: Reassemble the cut-up picture, or match the colored edges, until every seam agrees.

Block Clear

• Place: Drag a piece from the three-slot tray onto the board.
• Clear: Complete a full row, column, or 3×3 box to clear it and score.
• The run ends when none of the tray pieces can fit anywhere.

2048

• Slide everything: Use the control pad, swipe across the board, or the arrow keys / WASD.
• Tiles slide to the wall and equal tiles merge — work toward the target value.

Tetris

• Move: Left / right with the pad, a swipe, or ← → / A D.
• Rotate: The rotate buttons, an up-swipe, or ↑ / W; Q rotates the other way.
• Drop: Soft-drop with ↓ / S; hard-drop with the double-down button, E, or Space.
• Pack full rows to clear them before the stack tops out.

Huarong Dao, Klotski, and Gridlock

• Slide: Drag a block and it follows your finger — a drag can turn corners. Or select a block and use the pad / arrow keys / WASD to slide it one cell.
• Goal: Walk the marked block onto its goal or out through the exit — free Cao Cao in Huarong Dao, drive the red car out the gate in Gridlock.
• Steps: The counter uses the classical count — one piece sliding any distance, even around a corner, is one step.
• Hint: Plays the next move of a shortest solution, so following it all the way solves the board in the fewest steps.

15 Puzzle

• Tap to move: Tap a tile next to the empty cell and it slides there. You can also drag a tile, or select it and use the pad / arrows.
• Every new game is a fresh shuffle, and it is always solvable. Put the tiles back in reading order to win; the hint suggests a next move when you stall.

Slide-In

• Drag a piece over a lane and it slides in from the edge until it jams. Where there is a buffer, drag or tap a piece into the buffer first, then slide it into the board.