#15 Yay Battle mode!
#14 Time to unleash my ultimate move in battle!
#13 Apparently dinosaur's make sequels better
#12 Speaking of sequels, this is a direct sequel in a permadeath series
#11 Masks

Nope.

#18
Probably the best flash game ever. It's a tower defense game.
Free or paid. Desktop or mobile.
It's set on medieval times.

#17
The best demo of all time.

#20 Final Fantasy IX

Why did it make the list?

Final Fantasy IX just does everything right.  There are several games on my list (including Final Fantasy games) which are so awesome in one way, that you overlook their other flaws.  Like FFX has an awesome story and characters, but the world is fairly linear.  And FFXII has a huge world to explore, but the story is kinda meh.  FFIX is probably not the best game at any one thing, but it just does everything right: characters, story, combat, exploration, music, graphics, etc....  I even love the minigames like Chocobo Hot and Cold.  FFIX only has one minor flaw which is its card game.  But that is kind of like the mole on Marilyn Monroe's face.  It is a tiny blemish on any otherwise perfect game.

Original experience:

This game was an amazing experience when it first came out.  To compare it with FFVII, I was totally blown away by the graphics of FFVII when it first came out, and yet FFIX has graphics that are so much better.  It almost looks like these games are from 2 different consoles, because FFIX looks so much better.  Also FFVII had an impressive 3 discs included while FFIX had 4 discs!  This game is massive.  But more importantly than the graphics was that this was simply a very charming orthodox fantasy RPG crafted to perfection.  After VI, VII, and VIII it seemed like Final Fantasy was going to a sci-fi/fantasy hybrid.  But FFIX brought the franchise back to its roots and made an awesome pure fantasy game.  

How does it hold up today?

It still holds up amazingly well.  I replay this game every 5 - 10 years, and I love it every time I play through it.  Usually, one of my pet peeves with PS1/N64 era games is that their graphics look incredibly dated.  This is not true of FFIX.  It still looks decent even today.  Also this game has a level of charm to it that is just hard to describe.  My daughter sometimes wants to play retro games that are before her time, and the game she most wants us to play together is FFIX.  I believe she really loves the Vivi character without even having played the game.  I would highly recommend this game to anyone looking for a well crafted, turn based, pure fantasy RPG.

15 MK8 DX?
14 Brawl?
13 Galaxy 2?
12 Radiant Dawn
11 Majora's Mask?

Damn all 5 correct.... I need to make my top 10 hints difficult beyond measure at this point :(

#17: Wii Sports?

23 Hint 1: You are a bald guy versus a Titan, with perks of course.
Hint 2: Depending on your path, your skills can change and even the soundtrack will change.
Hint 3: Although you can't travel by car or plane, you can still use your powers and the map to travel very quickly across it.
Hint 4: By powers I mean using Lightning.

21 Hint 1: This game was a rebirth for the franchise after fans hated the game before it. However it was only the 2nd game out of 3 in the series to release that gen, to compare to this gen so far 0 have released.
Hint 2: Tons of characters, tons of weapons, let loose the riffraff slaughter.
Hint 3: Lot easier to rack up the KOs than earlier games and also no bodyguard system.

20 Hint 1: You are mister goldilocks in a strange foreign land.
Hint 2: A 2017 game where you most often kill demons, but enemy humans are also quite the nuisance.

19 Hint 1: A platformer game that launched the same week as the PS2, but it was PS1 exclusive. Didn't stop it from being a critical and commercial success.

18 Hint 1: 2nd game in a series that is normally set in Japan, this one however is set in China.

Though FE3 is also a direct sequel of the original FE game, so that could work as well :p

Close. But I mean a real demo.