General Information ← Knowledge Base What is RiffTrax? How do I enjoy a riff? Watching a riff sounds hard. How do I use my gift cards? Can I upgrade my purchase to HD? How long do I have to watch my purchases? What are "RiffTrax Presents"? What's an "iRiff"? Why don't you do as many blockbuster MP3 riffs? Is corn grass? How do I redeem my Humble Bundle code? How do I get my #BringBackMST3K Rewards?