Building an interface

Panels, labels, and buttons that answer the player.

Everything on screen draws under a ScreenGui, and the layer is a template: build it once in StarterGui and each joining player receives a copy in their own PlayerGui.

Lay the interface down

In the Explorer, click StarterGui, then drag a ScreenGui onto it from the Insert palette. Put a Frame under the ScreenGui the same way.

A new frame draws nothing, because BackgroundTransparency starts at 1. Give the frame a BackgroundColor3 and set the transparency to 0 to see the panel.

Put things where you want them

Position and Size are UDim2: a fraction of the parent plus a pixel count on each axis, so a panel can sit at half the screen and stay there through a resize.

button.Position = UDim2.new(0.5, 0, 0.5, 0)
button.AnchorPoint = UDim2.new(0.5, 0.5, 0.5, 0.5)

AnchorPoint names which point of the object Position refers to, which is the shortest route to a centered anything. UDim2.fromOffset(180, 44) gives a pixel size with no scale part.

Words and buttons

A TextLabel draws text inside its bounds: Text, TextColor3, TextSize, and the two alignments. A TextButton is a TextLabel the player can click. Connect MouseButton1Click for a left click; there is no Activated event.

Property	Type	What it does
Text	string	The string to draw.
TextColor3	Color3	The text color.
TextSize	number	Height in pixels. Default 18.
TextXAlignment	number	0 left, 1 center, 2 right.
TextYAlignment	number	0 top, 1 middle, 2 bottom.

The two alignments are plain numbers, not enum items. TextLabel holds the full property list.

A UICorner under any of them rounds the corners, and a UIStroke draws an outline.

Make it answer

Put a LocalScript under the ScreenGui, next to the things it drives. The copy in PlayerGui is what runs, and script.Parent finds the layer from inside it:

local panel = script.Parent:WaitForChild("Panel")
local toggle = panel:WaitForChild("Toggle")

local shown = false
panel.Visible = shown

toggle.MouseButton1Click:Connect(function ()
    shown = not shown
    panel.Visible = shown
end)

Hover colors read the mouse events, which need Active set to true on the object:

toggle.MouseEnter:Connect(function ()
    toggle.BackgroundColor3 = Color3.fromRGB(70, 120, 210)
end)

toggle.MouseLeave:Connect(function ()
    toggle.BackgroundColor3 = Color3.fromRGB(45, 110, 200)
end)

Layers and respawns

Three ScreenGui properties control a whole layer:

Property	Type	What it does
Enabled	boolean	Whether the layer draws at all.
DisplayOrder	number	Draw order between layers, with higher values on top.
ResetOnSpawn	boolean	Whether the layer is dropped and rebuilt when the character respawns. Default true, so turn it off when an interface should carry over a respawn.

Moving things

TweenService animates parts, humanoids, and SoundService, and nothing else. A tween built on a Frame runs, fires Completed, and moves nothing. Interface motion is a property write: set Position or Visible from code and the object lands where you put it.