Trine 4: The Nightmare Prince for 6,73 EUR / end / or 4-pack for 15,38

I found information about that deal on another forum, and some people bought it and activated on Steam with no problemo.

I'm guessing it's the rule for every game. Someone from a region where prices are more than 10% lower won't be able to send you a Steam Gift.

It's the old method to block cross region gifting, before the 10% stuff is implemented.

And of course, it doesn't apply to keys, only store purchase

This shop 'gamazavr.to' have some 'feature' that unable you to buy game with region lock. After adding game you cannot do a purchase

Maybe they're trying to rejuvenate the series with this new game.

Yeh ,at first glance it looked ok
but after playing it for a bit it just felt off in some way.
It sort of felt like they hadn't quite mastered how to make a 3d world game.

I really enjoy this one, but I haven't played the earlier 3.

Maybe it's over, but there is nice deal to buy 4-pack for 15,38 euro - https://yuplay.ru/product/14798496/

It is. And its amazing.