The Same Game codebase lacked structured documentation explaining its graph-based architecture, AI algorithms, and implementation patterns.

Documentation Added

• INDEX.md - Navigation hub with learning paths by user type (beginner/intermediate/advanced)
• README.md - Complete reference covering architecture, algorithms (BFS, Minimax, DP), data structures, build instructions, and design decisions
• CODEBASE_SUMMARY.md - Quick reference with file responsibilities, common operations, and performance characteristics
• CODE_FLOW.md - Visual diagrams showing application startup, game loop, move execution, gravity mechanics, and AI decision tree

Coverage

• Graph-based data structure (nodes + adjacency lists vs 2D arrays)
• Algorithms: BFS cluster detection O(N), Minimax with DP memoization O(B^D), two-phase gravity O(R×C)
• Architecture: SameGame (logic) decoupled from SameGameGUI (SDL2 rendering)
• AI: 3-move lookahead evaluating top 6 clusters with state caching

Example

From CODE_FLOW.md - Computer AI decision process:

getBestMove()
  └─► getAllClusters() → Sort by size → Evaluate top 6
      └─► For each: saveState() → simulate → dpEvaluate(depth=3) → restoreState()
          └─► dpEvaluate: Minimax tree with memoization
              └─► Return computerScore - userScore

Total: 1,458 lines across 4 files, cross-referenced and scannable.

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