For a "new" player today, a Product Key (Steam/GOG) is the only functional option. A Retail Code is a collector's item, not a playable game.
Thanks to this clarification, I redeemed my old retail code on Steam without any issues. No duplicate purchases, no wasted time. If you’re holding an old Opposing Fronts disc, just know: your retail code your product key for physical installs, but for digital redemption, follow the steps exactly as described here. Lifesaver! For a "new" player today, a Product Key
: If using old discs, it is recommended to install Opposing Fronts first, then use the in-game "Add Product" option to register the original game key. No duplicate purchases, no wasted time
| Problem | Solution | |---------|----------| | “Invalid product code” in Steam | You likely have a legacy retail code. Contact Sega Support. | | Key works but game doesn’t launch | Install v2.700 patch (last official) or use Steam’s verify files. | | Bought “new” from key shop but code used | That’s a scam – only buy from trusted stores. | : If using old discs, it is recommended
