Favorite Video Game of all time?

Title. Also, explain why its your favorite. 

It can be Touhou, however it isn't limited to just that. I'll go first, since well, I created the thread.

My favorite video game(s) is actually a tie between five games, Resident Evil 4, Metal Gear Solid 3: Snake Eater, Grand Theft Auto V, Pokemon: Crystal, and Tetris.

1. Resident Evil 4: This game is just amazing. A big step away from the old, outdated game style of the past Resident Evil's, it was a perfect blend of survival horror, and an action shooter. With a great story, fun gameplay, and ported to many consoles, its hard not to love this game. Plenty of post game content as well, such as the Mercenaries mode, its hard not to love this game. It also has some of the best boss battles I've played, such as the final showdown against Saddler, or the eerie confrontation in a prison with the Garrador, to even a huge lake monster, this game is pure awesome. 

2. Metal Gear Solid 3: Subsistence: I love this game to death as well. Set in the Cold War, a prequel to the past Metal Gear Solid games, it follows the original Snake, Naked Snake. Subsistence is actually an enhanced version of Snake Eater, so that's why I put it here instead of Snake Eater. With tons of weapons, fun camouflage system, tense sneaking sections, and some of the best boss battles in gaming history. The End and The Boss, or even The Ladder come to mind. It was ported to the 3DS as well, so you can play it on the go. One of the best stealth games of all time.

3. Grand Theft Auto V: A series of great controversy, Grand Theft Auto V is one of the best games of the seventh console generation, pushing the system capabilities of both the PS3 and the Xbox 360, and later the PS4, Xbox One, and the PC. The true definition of an open world game, it allows you to do whatever the hell you want straight from the get-go. With the most vehicle variety and weapon variety of any of the past GTAs, and a map larger then most of the past GTAs combined, this game has it all. Sadly, the story is nothing special, just robbing banks, but nevertheless, it's hella fun. With a new, switching character mechanic, and an online mode, GTAV is one of the best games of all time. 

4. Pokemon: Crystal: An oldie, but a goodie. I put this here instead of the newer Heart Gold and Soul Silver just for nostalgia purposes. At the time, Pokemon Crystal was mind blowing. A new reigon, Johto, while still letting us explore the old one, Kanto, and letting us fight all of those familiar faces, Crystal was huge. 16 Gym leaders, and 251 Pokemon, it pretty much doubled what the original Pokemon Red and Blue had. It also (I've been saying this alot) one of the best boss battles ever. Who could forget the first time they battled Red? The hero from the past game, the protagonist, the person you played as. Holding some of the highest leveled Pokemon of all time, and a well balanced team of six, Red was a tough opponent for any kid back in the day. Sadly, he lost most of his difficulty in Heart Gold and Soul Silver, seeing as we have over 400 Pokemon to work with now. Nevertheless, Red still remains as one of the toughest boss battles of all time. 

5. Tetris; The last on this lengthy opening post. Tetris is one of the oldest video games of all time, and its still played to this day. The most ported game of all time, Tetris is simple, addicting, and fun. Stacking, stacking, stacking, you can never stop! Proof that gameplay is more important then graphics or story, Tetris changed the gaming industry forever, single handily changing gaming into a world wide phenomenon. What game do you know that was released 31 years ago, and is still being ported to new consoles and played today? Exactly. 

Now, enough about me and my ranting. Let's hear yours.