Scale for the smallest screen
Roblox UI lives on phones, tablets, desktops and TVs. Design in Scale (percentage of screen) rather than Offset (fixed pixels) so frames resize, and test at the smallest phone viewport before shipping. Buttons need generous hitboxes — a thumb is not a mouse cursor, and the bottom corners are the natural thumb zone.
The information hierarchy
Players process a game’s UI in under a second: what is my health, what is my money, where is the button. One primary currency display, one primary action cluster, everything else in menus. Resist the urge to display every system at once — progressive disclosure (UI appearing as systems unlock) is the pattern every top game uses.
Nine-slice and style consistency
The 9-slice image property lets one bordered image scale to any button size without stretching corners — the standard for clean frames. Pick a corner radius, a border weight and two fonts, then never deviate: UI consistency reads as competence, and competence reads as trust when you ask players for a purchase.
