You cannot copyright a game mechanic or ruleset. Copyright protects expression, not ideas.
| Tool | Protects | Cost/Time | Duration |
|---|---|---|---|
| Trademark | Game name, logo, tagline, trade dress (box look) | $250–350/class (USPTO); 6–18 mo | 10 yr, renewable |
| Patent (Utility) | Novel, non-obvious mechanic/system | $10K–20K+; 2–4 yr | 20 yr from filing |
| Patent (Design) | Ornamental design (card shape, box, board) | $2K–5K; 1–2 yr | 15 yr |
| Trade Secret | Unpublished mechanics, algorithms, balance data | Free (NDAs, security) | Indefinite (if secret) |
| Copyright (Registration) | Art, text, code (enables statutory damages) | $45–125; 3–6 mo | Life + 70 yr |
Lewis Galoob v. Nintendo (1992): Game Genie not derivative. Tetris v. Xio (2012): "Look and feel" (expression) protected, not rules. DaVinci Editrice v. Ziko Games (2010): Bang! mechanics not copyrightable.
Protect the art, trademark the name, patent only the genuinely inventive.