One of the great masterpieces of ZZT, You Vs. Stupidity 2 is my favorite game.
In YVS2, you battle the evil forces of stupidity, led by a mysterious foe known as the Plagiar, who likes to be unoriginal and tends to steal boards from other games.
The game takes place in a large town, with several locations for you to visit. Within each is some sort of general stupidity for you to sort out, usually culminating in some kind of huge, well-programmed boss battle. The mission-based gameplay is well-thought out and can be replayed repeatedly without growing old; in fact, in the Blue's Clues area there are three ways to accomplish your mission of killing Blue and blowing up his house.
The graphics are pretty good, and there's a good font that makes them better.
Everything in the game oozes with weird humor and plot, and the whole thing is pretty long, at least by ZZT standards- it takes somewhere from 2-4 hours to beat.
You must download this game and play it now. The graphics, the plot, the bosses, the humor, the gameplay, they all command you!