A mix that rotates through the five games H, O, R, S and E.
The letters stand for Limit Hold'em, Omaha Hi-Lo, Razz, Stud and Stud 8, and all 5 games are fixed limit. It joined a major world-class series in 2002 and became the entry point to live mixed games. Example: Hold'em and Omaha use blinds while Razz, Stud and Stud 8 use antes, so the button freezes when moving from O to R and resumes when going from E back to H.