Card Game Simulator allows users to create, share, and play custom card games on an intuitive virtual tabletop. With the ability to import custom cards, decks, and games, users can personalize their gaming experience. The program offers features like creating custom games, exploring cards, editing decks, and supports both single-player and multi-player modes.

Users can download additional games, create custom games in Developer Mode, and define custom games following the provided documentation. The Cards Explorer feature enables easy browsing and filtering of cards, while the Deck Editor allows for the creation and editing of decks. Multi-player mode supports online play over LAN or the internet, with single-player mode also available for solo or hot-seat gaming.

Key features include an online sandbox with unlimited games, realistic card interactions, support for up to 10 players online, deck sharing, and various default games like French-Suited 52-cards, Dominoes, and Mahjong.