Game UI UX design HUD

The best game UI is the one players never consciously register. If someone finishes a session and thinks “that HUD was great,” you probably over-designed it — good UI disappears into the experience, delivering exactly the information a player needs at the moment they need it, then getting out of the way. Getting there requires deliberate decisions about information hierarchy, readability under pressure, diegetic vs non-diegetic presentation, and menu flow that respects the player’s mental model. Most indie UI problems aren’t art problems — they’re architecture problems.

What is the difference between diegetic and non-diegetic UI, and when does it matter?

Diegetic UI exists inside the game world — a health meter on a character’s chest armor, an ammo count on the gun itself, a map pinned to a wall in the environment. Non-diegetic UI floats in screen space outside the fiction: the classic health bar in the corner, the minimap overlay, the damage numbers. Neither is inherently better. Diegetic UI can deepen immersion but costs significantly more art and engineering time, and it can fail badly in multiplayer or when camera angles obscure the element. Non-diegetic UI is faster to implement and easier to read, but it can break tone if you’re going for a cinematic experience. The practical answer for solo dev on a vertical slice: use non-diegetic first, ship something readable, and only invest in diegetic elements where the payoff is obvious and the scope is controlled.

How do you build an information hierarchy that works under pressure?

Start by listing every piece of information your HUD displays, then rank them by how often a player needs to act on that information in a split second. Health, ammo, and immediate threat indicators are tier one — they get real estate and high contrast. Objective markers and map context are tier two — present but not demanding. Inventory counts, XP progress, and passive buffs are tier three — accessible but not competing for attention during a fight. The mistake I see constantly in indie games is treating everything as tier one. When everything is loud, nothing is readable. In Unreal Engine, I structure HUD widgets in layers: a combat-state layer that activates high-contrast elements when threat state changes in the blackboard, and a passive layer for everything else that fades to low opacity outside of combat. The player’s eye naturally goes to what changes — lean into that.

What makes HUD elements fail under actual play conditions?

Contrast is the most common failure. Designers test UI against static screenshots on a calibrated monitor — players use it on TVs with weird color profiles, in bright rooms, during fast-moving scenes with particle effects and screen shake. Safe UI design means testing contrast against your worst-case backgrounds, not your best-case ones. Beyond that, the common failures are:

  • Text too small to read at couch distance on a TV — use the 10-foot rule, target at least 28px equivalent at 1080p for anything a player reads in motion.
  • Health and resource bars with no secondary encoding — if color is your only signal, colorblind players are locked out. Add shape changes, fill direction, or icon states.
  • Screen-edge UI that gets cropped by TV overscan — keep critical elements inside a 90% safe zone.
  • Damage numbers that spawn too frequently and clutter the entire screen — pool them, limit visible count, and fade fast.
  • Icons that look great at 512px and become unreadable glyphs at 32px in-game.

How do you design menus that players move through without thinking?

Menu flow is a graph problem. Every screen is a node, and every path through it should have a clear entry, a clear purpose, and a clear exit. Players should never open a menu and wonder where they are or how they got there. Practically: limit menu depth to three levels maximum before the player loses their mental model of the stack. Use consistent back navigation — always the same button, always top-left. Group related options by the decision they support, not by their internal data category. Settings screens are the worst offender here — “Audio,” “Video,” “Controls” are engineering categories. Players think in terms of tasks: “I want to make the game quieter,” “I need to remap jump.” If you’re building menus in Unreal, UMG with a named widget stack managed through a Game Instance subsystem keeps navigation history clean and avoids the spaghetti of calling AddToViewport everywhere.

Controller vs mouse: why can’t you just build one and ship both?

Because the input model is fundamentally different. Mouse UI is pointer-based — the player can click anywhere with pixel precision, so small hit targets and dense layouts are tolerable. Controller UI is focus-based — the player navigates a graph of focusable elements, and if your focus order doesn’t match the visual layout, the experience breaks immediately. You cannot auto-generate good controller navigation from a mouse layout. Elements that visually float on screen need explicit focus neighbors set. Scroll regions need clear entry and exit behavior. Button prompts need to swap dynamically when the player switches input device mid-session. In Unreal, the CommonUI plugin handles a lot of this if you design around it from the start — retrofitting it later is painful. At Sinfull Studios, the lesson learned hard is: decide your input targets before you build the first widget, not after.

What accessibility considerations actually matter for a small indie game?

The non-negotiables that cost the least and help the most:

  • Colorblind modes or secondary encoding on all status indicators — red/green alone is not sufficient.
  • Subtitles on by default, with options for size and background contrast.
  • UI scale slider — some players need everything larger, and it costs you almost nothing to expose the DPI scale value.
  • No time-limited UI interactions (button holds are fine; countdown prompts that disappear in 3 seconds without a pause option are not).
  • Input remapping for at minimum the critical action bindings.

None of these require a dedicated accessibility sprint. They require making design decisions with a slightly wider lens from the start. The “good enough” bar for accessibility in an indie game is higher than it was five years ago — players expect it and they notice when it’s missing.

How do you know when the HUD is actually working?

Playtest for absence. Watch someone play and note every time they pause to read the UI, every time they miss information that the UI was supposedly showing them, and every time they open a menu and backtrack. Those are your failure signals. Silence — the player just playing — is your success signal. A good HUD communicates so clearly that players absorb information without breaking flow. If you can sit a fresh tester down, watch them hit a combat section, and they never glance at your health bar at a weird moment trying to figure out what it means, you got it right. That’s the actual design target: not “beautiful UI” or “immersive UI” — just UI that disappears.

What are the most common indie HUD mistakes to cut before shipping?

Based on builds I’ve reviewed and mistakes I’ve made myself out of Regina, Saskatchewan while shipping game prototypes under Sinfull Studios, the list looks like this: too much information on screen at once, no visual hierarchy, UI that was never tested on a TV at couch distance, controller navigation that clearly was an afterthought, accessibility that’s a single “colorblind mode” toggle that doesn’t actually change anything meaningful, and — the most pervasive one — menus that were designed by someone who already knows exactly where everything is. Your mental model of your own menu is not your player’s mental model. That gap is where most menu UX problems live. Build it, then watch someone who has never seen it try to navigate to three specific settings. What you see will be more useful than any style guide.

Explore Game Development with Unreal Engine at Sinfull Studios for more.

Frequently Asked Questions

What is the difference between diegetic and non-diegetic UI in games?

Diegetic UI exists inside the game world — health meters on character armor, ammo counts on weapons, maps pinned to in-world surfaces. Non-diegetic UI overlays the screen outside the game fiction, like health bars in corners or minimap overlays. Diegetic UI can deepen immersion but costs significantly more art and engineering time and can fail when camera angles obscure elements. Non-diegetic UI is faster to implement and more reliable to read, making it the practical default for indie or solo developers who want a solid, readable HUD without the scope risk.

How do you make a game HUD readable under pressure and fast-moving gameplay?

Build an explicit information hierarchy and design to it. Rank every HUD element by how urgently players need to act on it — health and immediate threat indicators get high contrast and prime real estate, passive elements like XP bars get low opacity outside of relevant states. Test contrast against your worst-case backgrounds, not clean screenshots. Add secondary encoding to any status indicator that uses color alone — shape changes, fill direction, or icon states — so colorblind players retain access to the same information. In Unreal Engine, using widget layers tied to gameplay state (such as a blackboard value driving a combat-state layer) keeps the screen clean and directs player attention where it matters.

What should indie developers do differently for controller UI navigation versus mouse UI?

Controller UI is focus-based navigation, not pointer-based, and you cannot auto-generate good controller navigation from a mouse layout. Focus order must be explicitly defined and must match the visual layout. Scroll regions need clear entry and exit behavior. Button prompts must swap dynamically when the player switches input device mid-session. The critical mistake is treating controller support as a retrofit after building a mouse-first menu system. Decide your input targets before building the first widget. In Unreal Engine, the CommonUI plugin handles much of this architecture if you design around it from the start — adding it later requires significant rework.

Related reading from Sinfull Studios

Sinfull Studios builds games in Unreal Engine from Regina, Saskatchewan. Have a project or a question? Get in touch.