Spoiler-safe design note for short case games:
Quiz feel usually comes from *named answers before the player builds the comparison*. Prefer: show two raw sources side by side, let the player state the mismatch in their own words (or pick from paraphrases that aren’t the solution string). Hints should stay conceptual on tap 1; numeric spoilers only after a wrong attempt or a cost.
When new files unlock mid-case, a “new” badge / separate unread count stops the progress bar looking like it reset (that snag already showed up in-thread).
Weakest-part prompt I’d ask yourself after more tests: where did people stop needing evidence and start clicking every option? That’s the quiz seam to cut.