List of unlockables, secrets and easter eggs

[Arthandas]

UNLOCKABLES

Individual character voice select - Beat Arcade mode with any character.
Barrel Buster bonus stage - Beat Arcade mode with any character.
Car Crusher bonus stage - Beat Arcade mode with any character.
Arranged BGM select - Set your title and icon.
Alternate rival battle - Hold all kick buttons when you see the "Now! Fight your Rival!" message while playing as Ryu, Cammy, Chun-Li, Seth, C. Viper or Guile.

Costume 1 for Ultra characters - Have SFxT in your Steam library to unlock additional costume for Decapre, Elena, Hugo, Poison and Rolento. Once unlocked, the costumes stay in the save file.

Character taunts 2-10 - Play 1/3/5/7/9/11/13/15/16 matches.
Character costume colors 3-10 - Play 2/4/6/8/10/12/14/16 matches.
SFIV character icons 1-4 - Complete 1/8/16/22 trials.

SFIV character silver titles 1-5 - Complete 2/3/4/6/10 trials.
SFIV character gold titles 1-5 - Complete 12/14/18/20/22 trials.
SFIV character blue title - Beat Arcade mode.
SFIV character red title - Beat Arcade mode on highest difficulty setting.
USFIV character blue title - Beat Arcade mode.
USFIV character red title - Beat Arcade mode on highest difficulty setting.

Secret Akuma Arcade mode boss - Don't lose any rounds and get at least 1 perfect victory.
Secret Evil Ryu Arcade mode boss - Don't lose any rounds, get at least 1 perfect victory and defeat Seth with Super or Ultra.
Secret Gouken Arcade mode boss - Don't lose any rounds, get at least 1 perfect victory, get at least 10 first attacks and 5 Super or Ultra finishes.
Secret Oni Arcade mode boss - Don't lose any rounds, get at least 1 perfect victory, get at least 10 first attacks and 5 Super or Ultra finishes and defeat Seth with Super or Ultra.

Prize code titles:
"A Gamer Appears" - MTXMYW139YPZJI
"Absolute Drama" - W0ZSV5SYW2ZEEJ
"Angry Dog" - LPTPV4J9PMLW5B
"Best Combo" - 82SPR56FW3JX48
"Better Luck Next Time!" - M42OLW0IHGLGMJ
"Black Sheep" - VX3Z62YP695UMM
"Bold Cat" - OFU11HD1VC3TJ5
"Breath of Summer" - H3EO9O5MZTCMLQ
"Capcom Fighter" - 8TGIXJVLEKEHG8
"Cheers!" - 0QLBUU3LB7R8WO
"Chocolate-Chip Cookie" - 2592B6JIV6CR49
"Combo Combo Combo!" - Q7V887R20SOLBC (for some reason doesn't work on PC)
"Dream Hit" - GVQ5KMMLP8I6L1
"Feels so good!" - 9S2E7ERBCPMMPO
"Fighting All Year Long" - EWSK6LY7LBMP9T
"Hit Me Again" - FPWA10SMZ378IT
"Justice till the End" - 1H98PF2079P43T
"Lightning Blast" - XVCXTA1Y16R9AG
"Nightmare" - 7QSID0IM3PPY3V
"Platinum Shine" - 9QSPWS2LIOZWXL
"Pro Animator" - T9N4MH7IIHT3R0
"Skillful Brother" - 277B47IFXCUUXB
"Stylish Blow" - OY3Z7APLVKV4Z4
"Sword Flash" - 8RGYZWZMJRL2OP
"You Need Spanking!" - CS93SZDFK5JLTI

EASTER EGGS

During a match on the Small Airfield, a black S.I.N. plane will land and its door will open, revealing Balrog who will watch the combatants from afar. If one of the players chose Balrog himself, Vega will appear instead. In a Balrog versus Vega match, the man on the plane will be M. Bison. This is a nod to the naming history behind these three individuals (and the fact they all belong to the Shadaloo).

There's a woman on the left side of the Exciting Street Scene that doesn't seem to be interested in the fight unless Dhalsim is one of the fighters. She cheers every time he scores a hit and jumps happily if Dhalsim wins a round. Similarly, she's worried when he's wounded and cries if he loses a round.

If there's a Cody mirror match and both players try to grab the knife at the same time, only one will succeed. The loser displays a shocked expression.

In the Skyscraper Under Construction you can see Hugo spectating the match on one of the background platforms. If he is participating in the fight, his place is taken by a huge construction worker. Similarly, Yun and Yang vanish from their background spots in the Half Pipe stage if they are part of the fight.

If you beat the Car Crusher bonus stage with a Final Fight character (Cody, Guy, Hugo, Poison or Rolento) a dude will amble out and cry "OH MY CAR!". This is a reference to the Final Fight series.

[Midnight Meows]

Minor correction. It's all punch buttons for the rival fights. All kicks go to the default rival.

[Cipher Esteria]

Car crusher. If you beat the stage with ANY Final Fight character, a dude will appear and cry "oh my car!" this is an reference to final fight. This includes: Guy,Cody,Rolento,Poison and Hugo.

[Arthandas]

@Another (ps3 pad)
Nope, it's kicks, just checked.
@Cipher
Yup, added.

[K4ever]

lol you think this is going to get sticked or something?

[Midnight Meows]

Originally posted by Arthandas:

@Another (ps3 pad)
Nope, it's kicks, just checked.
@Cipher
Yup, added.

I'll have to check arcade mode again to be sure but i'm pretty sure that I press PPP to enter the fight with Juri. In fact I typically remind myself of which button to hold by thinking that Juri's mostly about kicks (taekwondo) and I hold the button opposite of that.

Chun's default rival battle is Viper.

[Useless Bunny]

The woman mentioned in Exciting Street Scene is actually Dhalsim's wife, Sally, that's why she cheers for him.

[Arthandas]

@Another (ps3 pad)
Well, I did two quick runs through the arcade mode with Ryu and I fight Ken if I press nothing, and I fight Sagat if I hold the kicks. Maybe punches work too, I'll check it later.

@Useless Bunny
Is there any in-game proof of that or is it just speculation?

[Useless Bunny]

Originally posted by Arthandas:

@Another (ps3 pad)
Well, I did two quick runs through the arcade mode with Ryu and I fight Ken if I press nothing, and I fight Sagat if I hold the kicks. Maybe punches work too, I'll check it later.

@Useless Bunny
Is there any in-game proof of that or is it just speculation?

There might be official stuff from her in the manga and other things that I never touched. In the games as far as I know there are no official mentions or appearances that leads that she's his wife, but it's heavily implied by the background since the other characters there are also village members and like Dhalsim, but she's the only one that cares a lot about him.

[Arthandas]

UPDATE
- added note to "Combo Combo Combo!" prize title that it doesn't work on PC
- added "Black Sheep" prize title

[arkadas1992]

awesome

[Bally]

The airplane wing on Small Airfield, the vase in Festival at The Old Temple, and the large wooden door in Old Temple can all be broken. The bicycle-riding man in Crowded Downtown can also be knocked down.

[c00lthulhu]

So, I did 22 of Chun's trials and I only unlocked 3 icons. I finished the last two and it turns out you've gotta do 24 instead of 22 for the fourth character icon. Should change that if you bother to do so.