Is it possible to giveaway a game from green man gaming?

*facepalm*

If it's a steam key I don't see why not.

Give the steam key to the winner.

If you buy a game from GMG you will recieve a key and IF you don't activate it yourself you can create a giveaway here and send the key to the winner via email, after the giveaway is finished.

Make sure on the GMG page it says, "This game requires a free Steam account to play.", which means you'll get a Steam key.

Create a giveaway, once it's ended, either add the winner or send the key over email.

You can giveaway a game key and when the winner is selected , you send it to his email or add him and give him through chat :)

I prefer giving through chat because its more personal and if he doesn't know how to active keys , you can help him or if he doesn't know how to mark as "Received" .

Just make sure the game you are buying is DRM : Steam , which means the key will be activated on steam

If you need anymore help just replay to me and I'll help you :D

here's a list of games that are redeemable on steam using a CD/retailer key

keys of games that are not on this list have low chances of redeemable on steam :) look for any tagline such as Requires Steam Workshops or DRM: Steam

seeing you as a new member to this community, I bid you welcome and hope you have a good time here =D