this was posted in another thread but figured it deserves its own so everyone sees it. Thanks @AdamMagus
Nice. Good looking out, bro!
Ahh, no bueno.. 
No Steam.
“This free gift is available to all visitors at our booth that received the Free Gift Handout Card and is available to both current and new players”
Context is important.
Free gift is available for everyone on a mobile device. No Free Gift Handout Card needed
It’s not working for me. I think it doesn’t activate if you’ve ever redeemed it for a previous event.
I’ve redeemed a few of these UNC. Most times I’ve had to quit mpq and it works the second time.
Just quoting the website. I can’t get the cover, so apparently “everyone” is not me, so not everyone, brah..
I was able to get it, but it wasn’t instant. I had to close the app, and when I reopened it, the cover popped up.
I went to Free Marvel Puzzle Quest Gift - 505 Go Inc., then clicked on the link on that page. My phone asked me if I wanted to open the link in Chrome or MPQ. I chose MPQ, it switched to the game and nothing happened. After waiting a few minutes, I went back to the original link again, clicked on the link on the page to get Gamora, then chose “Chrome”… which flickered a second, then opened MPQ, and I got my cover.
Not working for me for Kindle Fire.
I did the same thing, only nothing happened either time. I didn’t get anything
(Yes I closed the game fully, I even restarted the phone, still nothing)
At the bottom of the page, it says if you claimed this before, you’re not valid and it won’t work.
Would explain why this didn’t work for me, cause I remember claiming this before.
So, what, this is a recycled link? I remember claiming 3marvel, 4 Dino (last year’s anniversary), and possibly another 3*something, all told, but nothing in 2019 I dont think…
I’m still mad I couldn’t get this one https://d3go.com/mpqavengersgift/ 
Jesus why did I not know about this one before now? It just expired a week ago. I’m so upset.
Got my free gift. Thanks!
Nice one 
worked for me.