Category	Principle / Heuristic	Status	Details	Where
CRAP	Contrast	Applied	Buttons and clickable elements use visible state changes on hover so players can immediately tell what is interactive. View GIF	Main menu buttons, character selection buttons, settings buttons, blue card answer buttons, final score close button
CRAP	Contrast	Applied	Buttons use visible state changes on press so players can immediately tell when an action has been selected. View GIF	Main menu buttons, character selection buttons, blue card answer buttons, settings buttons
Nielsen	Error Prevention	Applied	Button press state prevents accidental repeated activation (does not trigger action multiple times).	Selection buttons and action buttons across menus and question screens
Nielsen	Error Prevention	Applied	Guard implemented to ensure the Scientist’s Sensor ability cannot be used more than once per question, so the player does not accidentally waste both of its limited uses on the same question.	Scientist ability on blue trivia/question cards
Accessibility	Accessibility	Applied	Font size accessibility toggle exists in Settings menu. When enabled, the game applies a larger-font stylesheet across the UI so facts, questions, buttons, and feedback text are easier to read. Font size setting is saved and persists between sessions.	Settings menu → Accessibility section; applied across menus, cards, buttons, and feedback screens
Accessibility	Accessibility	Planned	Text-to-Speech accessibility setting with speaker toggle on fact/question cards and stop/restart behaviour.	Planned for blue fact cards and blue trivia/question cards
Accessibility	Accessibility	Applied	Adjustable audio in the Settings, allowing players to reduce or mute music and sound effects based on comfort and sensory preferences. Audio settings are saved and persists between sessions.	Settings menu → Volume section
CRAP	Contrast	Applied	Selected MCQ answers look different from unselected ones.	Blue trivia/question cards
CRAP	Repetition	Applied	Consistent modal structure across game: dim backdrop + centered popup card.	Grey alert pop-up, settings pop-up, blue card pop-ups, character info pop-up, final score pop-up
Nielsen	Help and Documentation	Applied	Character selection includes “Click on a character to know more!” The player can see a character info popup that provides help through descriptions, abilities, and best-for guidance.	Character selection screen and character info pop-up
Nielsen	Help Users Recognize, Diagnose, and Recover from Errors	Applied	Wrong answers explicitly say they are incorrect.	Blue trivia/question feedback screen
Nielsen	Help Users Recognize, Diagnose, and Recover from Errors	Applied	Feedback includes an explanation message, not just correct/incorrect. Additionally, wrong-answer feedback appears before the backstep consequence, so the player sees what happened first.	Blue trivia/question explanation and wrong-answer feedback screen
Accessibility	Accessibility	Planned	Adjust difficulty dynamically would change question difficulty based on recent performance to reduce frustration and better support different learning speeds.	Planned question system for blue trivia cards and difficulty progression during gameplay
Nielsen	Aesthetic and Minimalist Design	Applied	Main Menu, Settings, and Final Score pop-up are focused and present key actions. Final Score screen, for example, is to the point with top summary, history, and close.	Main menu, settings pop-up, final score pop-up
CRAP	Alignment	Applied	Main menu: centered and grouped cleanly Settings: vertically aligned into title, volume section, accessibility section, close action Final Score: aligns summary at top, scrollable history in middle, close action at bottom Character Selection: left/right split layout, with image/title on the left and readable text on the right Character Info screens: consistent horizontal card row, with aligned titles, abilities, and select buttons	Main menu, settings pop-up, final score pop-up, character selection screen, character info pop-up
CRAP	Proximity	Applied	Each character’s image, name, subtitle, abilities, and select button are grouped together, so each card reads as one choice.	Character selection screen and character info pop-up
Nielsen	Visibility of System Status	Applied	Dice button shows the rolled value during movement, then returns to “Roll Dice.” View GIF	In-game board screen → Roll Dice button
Nielsen	Visibility of System Status	Applied	AQHI score is always visible through label + progress bar. View GIF	In-game board HUD / top-left AQHI display
Nielsen	Consistency and Standards	Applied	Consistent font across scenes.	Across all screens -- Main menu, character selection, character info pop-up, settings pop-up, in-game HUD, final score pop-up
Nielsen	Consistency and Standards	Applied	Consistent hover/click treatment across interactive buttons.	Interactive buttons across menus, pop-ups, and blue trivia/question cards
Nielsen	User Control and Freedom	Applied	Back button on character selection, difficulty popup, and close buttons on settings, character info, and final score popups.	Character selection screen, difficulty pop-up, settings pop-up, character info pop-up, final score pop-up
Nielsen	User Control and Freedom	Applied	On MCQ cards, selection can be changed before submitting.	Blue trivia/question cards