In addition to only focusing on delivering regular play, the game also offers multiple levels of difficulty, tracking of game time, and even surfacing the player's chance for victory. The game offers useful background services such as a ribbon-style toolbar that also keeps score and time, easy tools for card and deck customization, the ability to change the card table color, and more. One of the most successful decisions that developers of Free Spider Solitaire 20 managed to make is to revitalize the visual aspect of this card game and give it an attractive and eye-catching layout, modern interface, and ability to customize cards and backgrounds.

The exact rulesets that are present here are - Rouge et Noir, Simple Simon, and One Suit, Two Suits, or Four Suits Spider. This popular solitaire variant is played with two or more decks and offers an additional challenge and more variation than just playing a regular Spider Solitaire game that many people are well versed in playing. Free Spider Solitaire 2021 is a PC-optimized version of the popular card game played all around the world but restyled into a modern package that is centered around not one but five distinct versions of Spider.