While Sleeper Fantasy may not offer the most extensive sports coverage compared to industry leaders, it focuses on providing a high-quality experience for the sports it does cover. The platform currently offers contests for the NFL, NBA, MLB, and various E-Sports titles, including League of Legends, Valorant, CS:GO, and Dota.

Sleeper Fantasy's strength lies in its unique and engaging contest formats that blend elements of traditional DFS with player props and social features. The platform's primary game types include:

1. Sleeper Picks: Maximum payout is 100x your entry fee. Select 2-8 players from multiple teams then predict if each player will achieve more or less than the predetermined performance metric for that game. Each Sleeper Pick you add will have a payout multiplier and your total payout multiplier will increase as you add picks. 

2. PicksVS: Available only in Alabama, Florida, Kansas, Massachusetts, West Virginia, and Wyoming. Drafting your team is similar to Sleeper Picks but in Sleeper PicksVS you are competing against other Sleeper users. The more predictions you add and the higher the difficulty of the predictions you make, the higher your potential VS Score will be. The maximum entry for a PickVS Regular Pool (5,000 entrants) is $50. The highest score from the pool is paid out 100x their entry fee. Additionally, before submitting your picks, it will display the minimum number of picks you need to get correct in order to guarantee a payout. Achieving this number of correct picks or more will guarantee a payout of your entry fee multiplied by your VS Score. 

3. Daily Draft: Available 24 hours a day, every 5 minutes, 8 competitors per draft. Similar to traditional DFS formats, users draft teams and compete against others for cash prizes. These contests are $1 to enter and after the draft you can choose to enter your selection into higher stakes contests with bigger payouts. 1st place receives $4, 2nd place receives $2, and 3rd place receives $1. 

4. Free-to-Play Leagues: Sleeper Fantasy offers free-to-enter fantasy leagues, providing an excellent opportunity for users to experience the platform's social features and engage with the community without risking their own money.

5. Sleeper Picks In-Game: Similar to Sleeper Picks but selections are made after the start of the game. Available for NFL, NBA, and MLB. 

Sleeper Fantasy provides a seamless user experience across multiple devices and may have one of the best user interface designs we’ve come across. The desktop website is well-designed, with a clean and uncluttered layout that facilitates easy access to your Fantasy Leagues, free play contests, and resources. The website platform is optimized for both desktop and mobile.

The IOS and Android apps are required to enter any of Sleeper’s paid contests. The platform's color scheme and typography ensure that important elements stand out, contributing to an overall positive user experience. Users praise the apps for their intuitive design, responsiveness, and easy navigation.