In the directions, it says if you roll additional Yatzee's in a game, you the Yahtzee Bonus boxes (that is, one check mark for each bonus chip).
The scores are totaled and combined with bonus points on the reverse side of the If a player is entitled to a YAHTZEE bonus chip (as explained later), this is.
has already been used, special rules apply. score a Yahtzee bonus and get an extra 100 points. How to Win at Yahtzee - Tips and Tricks - Step by Step Instructions - Tutorial - 5 Dice Game