If you previously purchased the game, you can still download and play it from your digital library (e.g., Steam).
Some communities track delisted games as "abandonware," though their legality and safety vary by region. Project CARS 3 System Requirements project-cars-3-free-download-pc-game-full-version
Buying a used physical disc for PlayStation 4 or Xbox One from marketplaces like eBay or Mercari. If you previously purchased the game, you can