The various kinds of Rummy 51 bonus offers will be covered in detail in this post, along with the top choices for both new & returning players abitcoin slots onlinend advice on how to take advantage of them. Rummy 51's Bonus Structures. A range of bonus structures are available in Rummy 51 to accommodate various player requirements and preferences. The most popular kind is the welcome bonus, which is usually given to new players when they sign up.