I used this with my 2nd grade middle school boys. They really enjoyed it.
I have 36 students in each class so the way I have the class set up is by having 6 teams each with small white boards and markers/erasers. I roll a 6 sided die to choose the team who will select the category. They select category/point value and we read the question as a class (slowly). I count down from 10 usually and then say boards up. I have the boys hide their answers until then. I count slower or faster depending on the difficulty of the question. After they show their boards then I click on the slide revealing the picture and then answer. Then they shout and celebrate! It's a lot of fun. If only one team gets the correct answer, I'll let them choose the next category/points; if not I just roll the die to select.
Enjoy!