Perquackey can have any number of players. Each player alternates forming as many words as possible in 3 minutes with the letter cubes.
Only five words of the same length are allowed per turn. That is, five three letter words, five four letter words, and so on. Words can be made in any order--it is not necessary to complete one group before going on to the next.
If you use the singular form of a word, you cannot also add an "s" to make the plural form. However, "es" and other plural forms are allowed.
A player becomes "vulnerable" upon reaching 2000 points. At this point, three extra cubes may be used. In addition, if the player scores less then 500 points on a turn, a penalty of 500 points is imposed. Even if the score subsequently dips below 2000, the player remains vulnerable.
The first player to reach 5000 points wins, even if not all players have taken their turns.