Missing base game, so I think the only people who can enter this already have it :p

I have Halo: The Master Chief Collection and it allows me to joib giveaway.
Please check the winner if they own the game before sending the game

Interesting... I bought Master Chief Collection, which included this. SG flags this as a DLC, but the store page says Master Chief Collection is not required in order to play this. But since SG says this is a DLC, the only people who can enter this giveaway are the people who already own Master Chief Collection, which in turn means they already own this. Looks like a support ticket will be required to update this game's listing to show it as standalone rather than DLC.

Out of curiosity, I checked 6 of the 9 current entries. All 6 of them already own this game. I don't think you're going to be able to give this away.

But thanks for making a non-bundle giveaway of a highly desired game! Have my 💙