GMOD: -I think Certain mods like maps, guns, cars, and NPCs require the other people to have the mods to see them, not sure about player models. -Don't forget to get the "Wiremod" thing from the workshop too. -I think if you want to play multiplayer you need something called "Hamachi". It's a server thing. Free to download. -The workshop on steam has some pretty great maps and stuff like that, I'd recommend a few but I have too many to list, so many that my computer crashes the game on startup -to download something from the workshop, just subscribe to it. -IMPORTANT:Some maps require you to "mount" a game to Garry's mod. Games like CSGO, CSS,HL2,HL2EP1/2 might be required to get the textures for certain maps from the workshop. BESEIGE -It's a game that's currently being developed but released in early access -You build contraptions to destroy buildings -Sheep can destroy your contraption too -If your machine is moveable, think about the weight of the machine (can it tip backwards? Forwards? Can it move properly?) Physics stuff. -know what the various parts do, some parts can come in handy when you least expect them too (A steering part can be used on a "helicopter" to help propel it forwards) That's pretty much what I got, hope it helps in some way.