Slider

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Overview

Slider is the sliding tile puzzle best known as the 15 puzzle: numbered tiles in a square tray with one square left empty. A tile next to the gap can slide into it, and the aim is to put every tile back in order, from 1 in the top left corner, row by row, with the gap in the bottom right.

Before each game you pick a board from 3 × 3 to 8 × 8, numbered or coloured tiles and one of four themes; each board size has its own scoreboard. Shuffles are random, but only half of all shuffles can be solved by sliding, so the game always deals one of those.

Made by: wasmga.me
Released: 2026

Controls guide

Playing

Key	Action
Click/touch	Slide a tile in the gap's row or column; the tiles between move with it
`Swipe`	Slide the tile beside the gap in that direction
`Arrow keys`	Slide the tile beside the gap in that direction
`Enter`/`P`	Pause

Cheatsheet

Rules

Goal: 1 in the top left, then in reading order, the gap last
Move: One tile sliding one square; sliding a row of three counts three
Clock: Starts with the first move and stops while paused
Score: n⁴ × 1000, divided by moves plus twice the seconds plus n²

Tiles

Numbers: Plain numbered tiles
Colours: Each row of the finished board has its own colour, so a tile shows its row at a glance

Tips

Solve the top row first, then the left column, and you are left with a board one size smaller. Keep going until only a 2 × 2 corner remains, which solves itself by going round.
The last two tiles of a row are the hard part: put the last one under the square where the second last belongs, slide the second last in beside it, then rotate both up together.
Clicking a tile several squares away from the gap moves the whole line at once. It counts the same moves as sliding them one by one, but saves time on the clock.
Count your moves on a 3 × 3: the hardest shuffles need 31, and most can be done in about 22.