How do you make a "Name that Character" obby?

I'm just asking for the code on how to do it.

First of all. Never put random tags onto your question. Your question does not involve animations, cframe, guis, or even the RbxLibrary..

You need a part and a script. Put the script into the part.

function Chat(m)
	if m=="WordHere" then
		script.Parent.CanCollide=false
		script.Parent.Transparency=.5
		wait(4)
		script.Parent.CanCollide=true
		script.Parent.Transparency=0
	end
end
all=game.Players:getChildren()
for a=1,#all do
	all[a].Chatted:connect(Chat)
end
game.Players.PlayerAdded:connect(function(p)
	p.Chatted:connect(Chat)
end)