L'une des premières modifications pour Serious Sam The Second Encounter, créée par un vétéran du forum SeriousZone - Dances with Kleer (DWK). À la base du projet : la modification de l'apparence des ennemis, des armes et des effets, ainsi qu'une accélération de la vitesse et de la hauteur de saut du joueur. Comme l'auteur lui-même le note :
Once upon a time there was this guy
who kept hearing about this game
called Serious Sam. Curious, he
downloaded the Demo. Blown away by
how cool it was he had to have the game.
First he bought The First Encounter and
then he played, then played some more.
Then he had to have The Second Encounter.
Then he played, then he played some more, and some more....
Then finally he learned to Dance with the Kleer.
AND DANCE HE DOES!