Выбирайте из 30 сохранённых этапов с классическими, змеиными, столбцовыми, якорными целями и обходами.
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.
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.
Stages use classic, snake-row, column, or spiral target patterns. Later arcs add an anchored target tile that cannot slide and a no-immediate-backtracking rule that makes the blank route matter.
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.
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).
Stages 1–15 teach three different target families—classic, snake rows, and column sweeps—before stages 16–30 add anchored tiles and no-immediate-backtracking. The final Crown Circuit combines spiral goals, an anchor, and route discipline.
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.
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.
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.