Nunca Cuatro is an online game available on La Nacion that invites players to fill in empty squares with either a circle or a cross, while adhering to the crucial rule that prohibits having four identical symbols in a row, column, or diagonal. This adds a layer of strategy and logic to the simple task of filling in squares, requiring players to think critically as they try to complete the board.

Once players fill in all the squares, they can check their solutions against the correct answers that are displayed beside the 'restart' button. This feature allows players to not only check their work but also learn from mistakes, enhancing their gameplay experience. The game encourages logical thinking and spatial awareness and is designed to be engaging for a wide audience.

Additionally, La Nacion appears to be keen on feedback from their users regarding their online games. They promote user interaction by providing an email address for suggestions and a WhatsApp channel for updates, indicating their commitment to improving user experience, which could help in enhancing player enjoyment and engagement with their online content.