Cosmic Memory
Flip cards two at a time and remember where they were — your move count is your score.
easy2–8 min
Nebula Slider
Fifteen tiles, one gap, an order to restore
Score0
Best0
Nebula Slider
An original Ludibre game. No account, no download — it starts the moment you press play.
Shortcuts: P pause · R restart. Your best score stays in this browser only.
About Nebula Slider
The sliding puzzle has an amusing mathematical quirk: one arrangement in two is unsolvable. Our generator only produces solvable grids, by shuffling backwards from the finished state.
Three sizes are available: 3×3 to warm up, 4×4 for the classic fifteen-tile version, 5×5 for a proper sitting.
How to play
- Click a tile next to the gap to slide it across.
- Put the tiles back in ascending order, gap last.
- The move counter is your score.
- No clock: take as long as you need.
Controls
| Key | Action |
|---|---|
| Click / tap | Slide a tile |
| Arrows | Move the gap |
| R | New shuffle |
Three ways to get better
- Solve the first row completely, then never touch it again.
- Finish each row with its last two tiles together, never separately.
- At the end only a 2×2 square is left — rotate it until it lands.
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