1. Go to: https://www.grabfreegame.com/giveaway/alien-invaders-steam-free-155
2. Complete all steps
3. Get the key
4. Activate it
Steam: https://store.steampowered.com/app/929730/Alien_Invaders
2. Complete all steps
3. Get the key
4. Activate it
Steam: https://store.steampowered.com/app/929730/Alien_Invaders