FreeCell
Highlights⌗
Description⌗
FreeCell is a solitaire card game featured in Windows since the 90s. The rules are simple and most of the deals are solvable, even if it takes countless retry.
Technology used:
- Casio BASIC for the original version FREECELL.G1M
- Deno 2
- React 19
- Vite 6
- TypeScript
Context⌗
After creating a few common games on a Casio calculator (Tic-tac-toe, Snake, 2x2 Tetris, Tap Taupe and Power 4), I wanted to create a more complex game.
Since a Casio calculator’s screen is only 128x64 binary pixels, displaying 52 cards is no easy task. Each card has a binary representation: 2 pixels for the family and 4 pixels for the value. Furthermore, to facilitate development with limited resources, the game state is read on the screen. As such, a pixel in the top right corner indicates if a card is present or not.
Binary representation doesn’t make it easy to finish a game. However, if you have an hour, it’s entirely possible.
Five years later, I adapted it in vanilla JavaScript to show it without requiring a calculator. A year later, I remade it with React for a new feature: side-by-side comparison with real cards.
Overview⌗
| Casio Display | Card Display |
|---|---|
 |  |