Proke, a word game developed by Peter Hastings, is all about vocabulary building... literally! The goal of it is to build a mighty tower to the heavens, and your only tools are quick thinking and linguistic fortitude. While racing the clock, type a word that has the designated prefix or suffix, or for extra height, both. The faster you type, the higher you'll build. Extra points can be scored for typing the letters that appear in Bonus Bubbles, or doing combos of words with same prefix/suffix. Proke is a light kind of game, but it's very addictive.