Level Design Introduction (Portal 2)/Gotchas
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what gotchas are
adding "gotchas" into your level can be things like deadly goo so lets add that you will need a texture for the goo and a trigger_hurt
where the goo is going to bego into hammer and dig out a hole like shown
getting the texture
make a block in the hole and make sure all faces are nodraw accept for the top which should be a texture starting with toxicslime
making the hazard
make a block with the trigger texture and make it an entity than name that entity trigger_hurt and set the damage to 1000. make sure to put the trigger under the goo texture face so it will work properly