Players that don't use the selection buttons when it's not their turn slow the game down. A table of 9, 6 players in play and the 6th player uses the entire clock to check? Is pretty ridiculous. There should be a little bubble that points to the boxes that can be selected explaining what they do in detail. Some but very few players claim they don't work. I've never had an issue with them. But I feel like most players don't use them because they don't know they can or don't know what will happen if they do.