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10x multiplies the amount of doom enemies by, you guessed it, 10. Enemies explode into multiples of ten as soon as the map starts. Due to collision problems, you are able to walk through monsters. Most monsters projectiles pass through each other, making it harder. Ammo on the map is also timesed by ten. Don't try this on NUTS maps! The WAD was based on a Serious Sam mod called Parse Error.