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-# 014-higher_lower
+# Higher Lower
 
+A console game from Udemy's *100 Days of Code: The Complete Python Pro Bootcamp*
+(day 14). Two Instagram accounts are shown. Guess which one has more followers.
+Every right guess adds a point and the winner stays for the next round. A wrong
+guess ends the game.
+
+```
+Compare A: Cristiano Ronaldo, a Footballer, from Portugal.
+
+ _    __
+| |  / /____
+| | / / ___/
+| |/ (__  )
+|___/____(_)
+
+Against B: Ariana Grande, a Musician and actress, from United States.
+Who has more followers? Type 'A' or 'B':
+```
+
+- Python 3.13 or newer, no runtime dependencies.
+- The function names follow the assignment: `format_data`, `check_answer`.
+- Each account is shown once per game; if you get through all 50, you win.
+- Follower counts are in millions and come from the assignment's data set.
+
+## Requirements
+
+- [Python](https://www.python.org/downloads/) 3.13 or newer
+- Optional: [Doxygen](https://www.doxygen.nl/) to build the source documentation
+
+## Set up
+
+Create a local virtual environment in `.venv`, activate it, and upgrade `pip`.
+
+Windows (PowerShell):
+
+```powershell
+python -m venv .venv
+.venv\Scripts\Activate.ps1
+python -m pip install --upgrade pip
+```
+
+Windows (Git Bash), Linux and macOS:
+
+```bash
+python -m venv .venv
+source .venv/Scripts/activate   # Linux/macOS: source .venv/bin/activate
+python -m pip install --upgrade pip
+```
+
+The game itself needs nothing more. To run the tests and the code checks, install the
+development tools:
+
+```bash
+python -m pip install -e ".[dev]"
+```
+
+## Run the game
+
+```bash
+python -m higher_lower
+```
+
+Type `A` or `B` and press Enter. Press Ctrl+C to quit.
+
+## Run the tests
+
+```bash
+python -m pytest
+```
+
+Check the code style and types:
+
+```bash
+python -m ruff check src tests
+python -m ruff format --check src tests
+python -m mypy src tests
+```
+
+## Build the source documentation
+
+The source uses Doxygen comments. The HTML output goes to `docs/doxygen/html`.
+
+```bash
+doxygen Doxyfile
+```
+
+## Project layout
+
+| Path | Content |
+| --- | --- |
+| `src/higher_lower/` | The game: `game_logic.py` (pure functions), `game.py` (the loop), `game_data.py`, `art.py`, `constants.py` |
+| `tests/` | pytest tests |
+| `docs/` | Planning and review documents (business case, plan, milestones, use case) |
+| `pyproject.toml` | Project configuration |
+| `Doxyfile` | Doxygen configuration |
+
+## License
+
+GNU Affero General Public License v3.0. See [LICENSE](LICENSE).