data.raw["tile"]["kr-creep"].collision_mask = { "ghost-layer", "ground-tile", "not-colliding-with-itself" }; -- "floor-layer"

data.raw["technology"]["kr-creep-virus"].hidden = true;
data.raw["capsule"   ]["kr-creep-virus"].hidden = true;
data.raw["recipe"    ]["kr-creep-virus"].hidden = true;

data.raw["technology"]["kr-biter-virus"].hidden = true;
data.raw["capsule"   ]["kr-biter-virus"].hidden = true;
data.raw["recipe"    ]["kr-biter-virus"].hidden = true;