Help with for loop?

When Counting Down, You have To Subtract the i.

You can count up with a for loop the same way you were trying with a switch in value ordering, like so,

for i = 1,30 do --Intermission--counts up
    GameTime = ValuesFolder:WaitForChild("GameTime")
    GameTime.Value = i
    wait(1)
end

This is the same as,

for i = 1,30,1 do --Intermission
    GameTime = ValuesFolder:WaitForChild("GameTime")
    GameTime.Value = i
    wait(1)
end

The extra one is basically always there unless altered. This is what I gets added by each time. So, in order to make the loop count down, we make the number a negative,

for i = 30,1,-1 do --Intermission--counts down
    GameTime = ValuesFolder:WaitForChild("GameTime")
    GameTime.Value = i
    wait(1)
end

That's how I remember anyway.

Good Luck!