Sliding 15
Choose from 30 saved stages with classic, snake, column, anchor, and detour goals.
World and Mission
The campaign starts with fifteen numbered tiles and one empty space, then opens six authored arcs: Open Corridors, Zigzag Gallery, Column Workshop, Anchor Workshop, Detour Circuit, and Crown Circuit.
Every stage asks you to preserve access while building a distinct target arrangement. Checkpoints at stages 5, 10, 15, 20, 25, and 30 mark the end of each five-stage arc.
How the Systems Work
A tile moves only when it shares an edge with the empty space. Diagonal moves, jumps over another tile, and swapping two occupied tiles are not legal.
From Stage 6, the blank cannot immediately reverse its previous move. From Stage 16, the marked anchor tile is fixed and cannot slide.
Complete a stage to save it locally and unlock the next stage. Hint marks one legal candidate without moving it; Undo restores the prior board and move count; Result offers Replay, Stages, or Next Stage.
Touch, mouse, and keyboard-friendly controls use the same board state. No timer, account, purchase, or network service is required; locale and sound preferences stay in this browser.
How to Play
- Choose Start Game from Main, then select an unlocked stage from the 30-card Stage screen.
- Read the arc rule and target pattern before sliding a neighboring numbered tile into the blank.
- From Stage 6, the blank cannot immediately reverse its previous move. From Stage 16, the marked anchor tile is fixed and cannot slide.
- Use Hint when you want one legal candidate, and Undo to compare a route or recover from a closed corridor.
- Match the stage target to complete it, save your progress, and use Result → Next Stage or Stages to continue the campaign.
Strategy Tips
- Work from the next target number, but do not trap the blank behind a row or column you still need.
- Keep more than one route to the next target when possible; a legal move can be safe now but harmful two moves later.
- Use the bottom row and right column deliberately because the final placement needs room for the blank.
- When the board feels stuck, use Undo to return to the last position with more open neighbors instead of guessing.
- Compare Hint with your own plan—the hint explains a legal option, not a mandatory solution.
Campaign and Difficulty Growth
The 30 selectable saved stages are arranged as six arcs of five: Open Corridors (1–5), Zigzag Gallery (6–10), Column Workshop (11–15), Anchor Workshop (16–20), Detour Circuit (21–25), and Crown Circuit (26–30).
From Stage 6, the blank cannot immediately reverse its previous move. From Stage 16, the marked anchor tile is fixed and cannot slide.
Every fifth stage is a checkpoint. Completing a stage unlocks the next one, while local progress keeps cleared stages available for replay and move-count improvement without a timer.
Developer Design Note
Sliding 15 uses the shared Classic Logic Lab shell, a responsive 4x4 board, a 30-stage authored campaign, stage-specific target rules, local progress, touch/mouse/keyboard input, localized Hint and Result feedback, reversible Undo, and an explicit Main-Stage-Battle-Result recovery path.
Player and Save Information
Sliding 15 is a general-audience browser puzzle. No account or purchase is required; cleared stages, settings, and local progress stay in this browser and may be removed when site data is cleared.
FAQ
- How many stages are there?
- There are 30 selectable stages across six five-stage arcs, with checkpoints at 5, 10, 15, 20, 25, and 30.
- What makes a move legal?
- A numbered tile must share an edge with the empty space; diagonal moves and jumps are not allowed.
- What are anchors and detours?
- From Stage 6, the blank cannot immediately reverse its previous move. From Stage 16, the marked anchor tile is fixed and cannot slide.
- Does Hint solve the puzzle?
- No. Hint marks one legal candidate, and you still decide whether to slide it.
- Can I undo?
- Yes. Undo restores the previous board and move count.
- Is progress saved?
- Cleared stages and the next unlocked stage are saved only in this browser; no account or cloud save is required.
