Hi amst4d, thanks for the reach out.
ya, the "Pit Blocks 3D" is successfully activated that time when I won, and no doubt i mark as received.
But after a few months, key is revoked by the game developer.
I have tried to contact the Game Dev, but since i unable to provide the purchase info (i only won it from steamgift, not the legit buyer.), so i am not be able to get the key unrevoked.

Here are the Dev response
https://steamcommunity.com/app/792000/discussions/0/2265815747942837726/

here are one of the review comment.
https://steamcommunity.com/id/WarspiteHerbFerg/recommended/792000/

Thanks.