In 2023, two of the most popular solitaire variations are "World of Solitaire" and "Google Solitaire." "World of Solitaire" is a comprehensive online platform that offers a wide array of solitaire games, catering to solitaire enthusiasts of all kinds. Its extensive game library, customization options, and a sense of community make it a top choice for players. On the other hand, "Google Solitaire" is a frequently played version of Klondike Solitaire available through Google's search engine, making it easily accessible to millions of users. These two variations continue to captivate solitaire players worldwide in 2023.