"unavailable" steam games

A meteorite will fall in your house.

maybe you trigger a zombie apoclypse, so do it

You can still play it as long as the key you received isn't region locked, you just can't buy it off Steam.

If the game is unavailable it means the aactivated key was region locked I think. It's weird that TremorGames provided such a key since they got them (probably) from Humble Bundle and those shouldn't be region locked. If it's unavailable - it's unplayable so I would contact Humble Bundle (in case it was indeed a Humble Bundle gift link from TG) and ask them how could it be that they provide region locked games... It shouldn't be like that I think. TG could give the coins back as well if the first option didn't help.
Edit.
Just read what someone above me wrote and in case this perosn is riht - I didn't know if You were talking about not being able to activate the game or not being able to see Steam Store page for the game.

Oh no, what have you done?! Cute pandas will take over you PC!

Sometimes games are unavailable in your country because they are simply not being sold there, but they can be activated and played without problem. For instance, censored games in Germany, Fallout 3 in India, etc...

Thanks
Anyways my brother bumped his toe on my bed and started moaning zombie sounds.

And then he threw a rock on my head.

So yeah a meteor fell on me and a zombie apoclypse happened

earth will be shattering into pieces! dont do it!!! pls

Well technically if it's unavailable, there are 2 kinds of unavailability: 1. The game unavailable and not playable in your contry/region.
2: The game unavailable, but playable in your country/region. You can check it with steamdb, search for "onlyallowrunincountries" If it's yes, then you can't play it without VPN ( I won't suggest that, because with that you would violate the Steam ToS ), but if it's No, you can play it without any problem. For example: I live in Hungary. We have most of the games uncut and available, but Injustice Gods Among Us ULTIMATE Edition has one costume, which is (as WB thinks) disturbing for us. We were invaded by the russians long ago (no hate), and there was a spinoff story that Superman landed not in America but in Russia, and on that costume he has the sickle-hammer, which is an autocracy symbol. So WB decided to not release the game in our country. We can't get it in retail, nor on Steam, but we can get it from foreign sellers, and it's playable in Hungary.

half-life 3 will be confirmed