This giveaway is on the Epic Games platform, Epic Games is giving away free games every week for a few years
To grab the game for free:
- Go to the store page of Fallout 3 Game of the Year Edition
- Click on the GET Button
- Verify that the price is zero
- Click on the Place Order Button
https://store.epicgames.com/p/fallout-3-game-of-the-year-edition
