Quarter Quells

Quarter Quells are special Hunger Games staged every twenty-five years. Each one has a unique twist to it which leads it to be more dangerous and, for the Capitol, more entertaining. According to Catching Fire, there is a small box with specific instructions for each Quarter Quell, which were planned at the founding of the Hunger Games. The President at the time is to select the appropriate card and read it off on live television to announce the theme of that year's quell. The known Quarter Quells are as follows:

50th Annual Hunger Games/ 2nd Quarter Quell: 2x as many tributes (48 instead of 24)

75th Annual Hunger Games/ 3rd Quarter Quell: tributes can only be selected from the previous victors