Closed Buraco has a particularity; you can not freely take the discard pile and its cards are not entirely visible.
Only the last card is visible and to take all the cards in the discard pile you must use it immediately in a meld to be placed on the playing field.
You will notice that, during the game, you can click on it and select it just like other cards.

To Recap...
Discard pile is Closed
Buraco 500 and 1000 points allowed
Clean Buraco NOT necessary for closing
Triplets are allowed
Jokers are in the deck and their value is 50 points (not 30 as in Italian Buraco)