Slidra

Slidra is a clean take on the classic sliding 15-puzzle. Fifteen numbered tiles sit in a four-by-four grid with one empty space, and your job is to slide them into order from one to fifteen. Tap any tile next to the gap and it slides in; simple to grasp, but arranging the whole board takes planning, patience, and a bit of clever sequencing near the end. It is the timeless puzzle that has kept people quietly hooked for generations, rebuilt for a phone screen.

Every game starts from a fresh, solvable shuffle, so you never hit an impossible board. Slidra counts your moves and your time as you play, giving you two natural ways to improve: solve it in fewer slides, or solve it faster. Chasing an efficient solution turns a casual puzzle into a genuine mental workout, while a relaxed play-through is a calm way to unwind. The board is large and readable with smooth tile movement, so the focus stays on solving rather than fighting the controls.

Slidra keeps your best results so you always have a personal target to beat. The How to screen explains the rules and offers a tip or two for untangling the final tiles, and Settings let you adjust sound and vibration. There is no account to create and no personal information required — open the app, shuffle, and start sliding.

Slidra runs fully offline and shows no advertising. There is no advertising identifier in the build, and nothing about your play is sold or shared. It is a small, elegant puzzle with lasting depth: order the tiles, then do it in fewer moves and less time than ever before.