The solution of the final puzzle has been posted below the corresponding GA

Hellow everybodey!

Exactly one year ago I was wandering through steam via browser to find a use for those damn sale cards: while exploring the community with the help of enhanced steam I've stumbled upon that little link to something called "Steamtrades" (I've never been into trading so that was unknown land to me) and once I was on that site I continued pushing here and there random buttons until I clicked on that writing..."Steamgifts".
Man I was sure that was a scam...free games? In exchange for nothing? Surely a scam. Totally a scam. But it's worth trying...free games, ya know, that offer would tickle anyone ( ͡° ͜ʖ ͡°)
And there started my journey that, as every newbie's approach with Steamgifts, started with "WOHOOOOO FREE GAMES I'M GONNA LEECH THE **** OUT OF THIS SITE" and soon became something more mature. I started passing by the forums and I discovered the puzzles (damn, I love the puzzles, I think that's the best thing on SG to me), I discovered the pleasure of giving to others (and the pleasure of cracking people's brain with the puzzles that I started creating), I've met a lot of beautiful people, evil puzzlers, sassy commenters, givers of any kind, awesome moderators, the god CG and so on...
Therefore I thank you all, I thank you all steamgifters that everyday make this community great but also funny, interesting, didactic, lewd ( ͡° ͜ʖ ͡°), challenging and, last but not the least, familiar c:

THANK YOU GUYS! <3

And...
Without further ado...
Here ya go with the gibs...
But first...
You'll have to overcome some trials.

P.S. You'll have one week of time to reach the end;
P.P.S. There's no level restriction and no SGtools;
P.P.P.S. If you're in trouble don't expect me to answer very soon because I've been working on this for the last two days and now I have a huge headache so I'll be a lot of time offline or afk (and I should also be studying atm since I'm gonna have an avakanche of examns in the next weeks ç_ç)
P.P.P.P.S. fourth, and I hope last, note: I won't reveal the title of the games behind the puzzle, buuuuuuuut...I know that not knowing it, if you're not a puzzle freak like me and many others, sucks, so I promise that if you reach the end and are not interested in any of the 40 GAs hidden behind the puzzle you'll be put in a list and from that list I'll draw one lucky winner that will receive from me one of their wishlisted games (of course if you only have AAA games worth 60 bucks on your WL I'll choose myself the game since I'm not uncle scrooge ><).

Hints for the final test have been added on the corresponding GA