A user interface (UI) is how humans interact with computers, systems, or devices. It bridges the gap between the user and the machine, allowing us to give commands and receive feedback. UIs can take many forms, from typing commands to clicking icons or even speaking instructions.

In the world of video games, user interfaces play a crucial role in shaping the player’s experience. Whether it’s navigating menus, issuing voice commands, or interacting with a virtual environment, the design of the interface can make or break a game.

This factsheet explores different types of user interfaces, their features, and how they are used in computing—and sometimes in games!

A Command Line Interface requires users to type text commands to interact with the computer. It’s powerful and efficient for advanced users who know the commands.

• Features:

  • Minimal system resources required.

  • Fast for experienced users but can be difficult for beginners.

  • Requires precise syntax. (spelling, grammar, spacing, symbols, etc.)

• Examples in Computing:

  • Accessing files, managing systems, or debugging using tools like Command Prompt or Terminal.

• Example in Video Games:

  • Some older games (e.g., Zork) and game development tools like debuggers or scripting tools use command-line interfaces for functionality.

A Graphical User Interface uses visual elements like windows, icons, buttons, and menus to make interactions easy to learn and user-friendly.

• Features:

  • Easy to learn, suitable for beginners.

  • Uses graphics, colours, and icons to simplify tasks.

  • Requires more system resources compared to CLI.

• Examples in Computing:

  • Operating systems like Windows, macOS, or Ubuntu.

  • Drag-and-drop features in file explorers.

• Example in Video Games:

  • Most modern games have GUIs for navigation, such as inventory screens, map systems, or health bars. GameMaker, for example, provides a GUI-based environment for creating games.

A Menu-Based Interface presents users with a list of options to choose from. It’s simple and ideal for devices with limited input capabilities.

• Features:

  • Step-by-step navigation with clear choices.

  • Limited options at any one time make it easy for users to decide.

  • Commonly used in kiosks or devices like ATMs.

• Examples in Computing:

  • Mobile phones or digital appliances.

  • Software setup wizards.

• Example in Video Games:

  • Menus are widely used in games for selecting options such as “Start Game,” “Settings,” or “Exit.” RPGs often use nested menus for quests, character stats, and inventory management.

A Voice-Activated Interface lets users interact with systems using spoken commands. This interface is popular for hands-free and accessibility purposes.

• Features:

  • Reduces the need for physical input devices.

  • Ideal for users with mobility or vision impairments.

  • Relies on natural language processing (NLP) to interpret commands.

• Examples in Computing:

  • Virtual assistants like Siri, Alexa, or Google Assistant.

  • Smart home systems for controlling lights or appliances.

• Example in Video Games:

  • Some games allow voice commands for issuing orders to NPCs or controlling in-game elements (e.g., Tom Clancy's EndWar).

A Touchscreen Interface relies on direct touch gestures to interact with devices. It combines simplicity and interactivity.

• Features:

  • Intuitive for users as they can directly interact with the display.

  • Commonly used in mobile phones, tablets, and kiosks.

  • Allows gestures like swiping, pinching, or tapping.

• Examples in Computing:

  • Smartphones, tablets, and interactive kiosks.

  • Drawing apps on touch-enabled devices.

• Example in Video Games:

  • Many mobile games, like Angry Birds or Clash of Clans, use touch interfaces for intuitive control.

A Natural User Interface allows users to interact with systems in ways that mimic natural behavior, such as gestures, motion, or speech.

• Features:

  • Often combines voice recognition, motion tracking, and haptic feedback.

  • Provides immersive, intuitive experiences.

• Examples in Computing:

  • Gesture-based controls like Microsoft Kinect or Leap Motion.

  • VR systems and AR applications.

• Example in Video Games:

  • Games using VR or AR, such as Beat Saber or Pokemon GO, rely on NUIs to provide interactive, immersive gameplay experiences.

User interfaces (UIs) come in various forms, each suited to different tasks and user needs. Command Line Interfaces (CLI) rely on typed text commands, offering speed and precision for advanced users, but requiring knowledge of exact syntax. 

Graphical User Interfaces (GUI) use visual elements like icons and windows, making them intuitive and accessible for most users, particularly in systems like operating systems or modern video games. 

Menu-based interfaces provide clear, step-by-step options, ideal for devices like ATMs or game settings screens. Voice-activated interfaces enable hands-free interaction through spoken commands, commonly seen in virtual assistants and, occasionally, in games that support voice commands. 

Touchscreen interfaces allow users to interact directly through gestures like tapping and swiping, commonly found in mobile devices and games. 

Finally, Natural User Interfaces (NUI) use motion, gestures, or voice to create immersive experiences, often seen in virtual reality (VR) games and advanced interactive systems. Each type of interface plays a unique role in how we interact with technology, from productivity to entertainment.