I've had two things on my mind I can't quite figure out. I know skip is mostly used in conjunction with hint textures to hint visleafs around your map, but I've also heard it's got a secondary function: to help things snap to the grid. I don't get that. Why couldn't you just turn on snapping and mess around with the grid size until it works? The second question I have involves rain and snow particle systems. I know how they're set up in TF2, but a lot of custom maps I've seen have the "flag as weather" field set to "no". Is there a reason for this? If you flag it as weather, the clients are then allowed to turn the effects on and off at their leisure to help with FPS.