yeah so you pick 3 teams 1st team is 2/1, 2nd team is 5/1, 3rd team is 10/1, you bet 10 points, the first one wins at 2/1 you now have 20 points going onto the 2nd team, now if they win at 5/1 you now have 100 points going on the 3rd team, if they win at 10/1 you won 1,000 points ( plus your 10 back depending what country and odds format you are using ), if any of them lose you will win nothing they all have to win in order of the payout, there is no cashout on them!!.
It is something I do have in my notes but it is a lot of work to do and a lot more new code will need to be written