The object is simply to get rid of your cards, and catch your opponents with as many points as possible. You start with 7 cards and a face-down deck of the rest in the middle. You play it like rummy, trying to get runs or 3/4 of a kind, but you put them down as you go, and other people can add to yours, for example if you put down 4,5,6 of hearts, someone else can add 7 of hearts when it's their turn, as long as they have put down a run or set already.
You pick up at the beginning and discard at the end of your go, but when you discard, you overlap the cards so you can see the discard pile. When it's your go, you can pick up any in the discard pile but you have to take all the cards on top of it as well.
I'm sure the name is a long word, but I can't remember it! Help!