2048

The original source of the 2048 sliding-tile puzzle. Perfect for learning web development.

Pro tips

1. Keep your biggest tile in a corner and avoid moves that pull it out.
2. Build a full row in descending order so chains merge in sequence.
3. Mostly use three directions. The fourth is your emergency exit.
4. Merge small tiles before they get walled off by large ones.

Image from the project's own page, README or Wikimedia Commons, owned by its creators. Source