Visual Diff

In code development, diffs are the primary tool for understanding changes. A code diff shows exactly which lines were added, removed, or modified, making code review possible. Without diffs, reviewing someone's changes would require reading the entire file and mentally comparing it to the previous version.

Game design documents and balance spreadsheets need diffs just as badly, but most tools do not provide them. Google Docs shows a timeline of edits but does not highlight changes inline. Google Sheets has no diff capability at all. When a balance designer changes 50 cells across a damage table, the only way to review the change is to manually compare two spreadsheets.

Visual diffs for game design content show changes in a format anyone can understand. For documents, changed paragraphs are highlighted with additions in green and deletions in red. For spreadsheets, changed cells are color-coded so a lead designer can instantly see that the healing potion went from 50 HP to 75 HP and the mana cost dropped from 30 to 20.