K-1 Arena Fighters

Alternate Uniforms
At the title screen, hold L1 + L2 + R1 + R2, until you hear 3 beeps. Press Start and now you should have alternate uniforms.


 Kagero: Deception II


 Kamen Riders

Hidden Characters
Get the Digital Card 7 and save the game. At the Character Selection screen, highlight Kamen Rider No. 1, hold Right + X and press Triangle. Get the Digital Cards 7 and 74 and save the game again. At the Character Selection screen, highlight Kamen Rider No. 2, hold Right + X and press Triangle.


 Kattobi Tune

Max Attributes
On the Scenario Mode's Garage screen, press Down, Down, Up, Up, Right, Left, Right, Left, Select, and your status levels will be maxed out in all categories.
Max Money
On the Scenario Mode's Garage screen, press Up, Up, Down, Down, Left, Right, Left, Right, Select, and you will have 99,999,900 credits.


 Kileak: The DNA Imperative

All Items
Wait until the conception sequence begins during the Title screen, now press Circle, Circle, Circle, Circle, Circle, Circle, sweep the D-pad in a clockwise Full-Circle three times, and press Triangle, Square, Square, Triangle, X, Start.
Invincibility
At the Title screen, quickly press [Triangle, Triangle, Left, Right, Square, Square, Select, L1, L2, R1, R2] three times within five seconds.


 Killer Loop

H&K Class 2
At the Main Menu, hold Start and press Down, Left, Up, Left, Down, Right, Up, Left.
H&K Class 4
At the Main Menu, hold Start and press Down, Right, Up, Left, Down, Left, Up, Right.
Pulse Class 2
At the Main Menu, hold Start and press Up, Left, Up, Left, Down, Left, Up, Left.
Pulse Class 3
At the Main Menu, hold Start and press Down, Left, Up, Left, Down, Right, Up, Right.
Pulse Class 4
At the Main Menu, hold Start and press Down, Left, Up, Right, Down, Right, Up, Left.
Reac Class 1
At the Main Menu, hold Start and press Down, Left, Up, Right, Down, Left, Up, Right.


 Killing Time

Play as the Boss
On the Main Menu, hold L1 + R2 + Circle + Start for 5 seconds. Then start a one-player game and choose any fighter.


 King of Fighters '95

Play as the Bosses
At the character select screen, hold Start and press Up + Circle, Right + Square, Left + X, Down + Triangle


 King of Fighters '96

Play as Goenitz and Chizuru
At the character select screen, hold Start and press Up + Circle, Right + Square, Left + X, Down + Triangle.


 King of Fighters '97

Play as Orochi
Go to Practice mode and press L1, L2, R1, R2, twice. Ororchi himself is only playable in practice mode, but the other five characters can be played in any mode.


 King of Fighters '98

Bonus Characters
At the Character Selection screen, highlight any of the normal version of the following fighters. Then hold L1 and press any button:
Evil Rugal Berstein
'95 Kyo
Real Bout 2 Terry Bogard
Real Bout 2 Andy Bogard
'94 Joe Higashi
'94 Ryo Sakazaki
'94 Robert Garcia
'94 Yuri Sakazaki
Evil Yashiro Nanakase
Evil Shermie
Evil Chris
Real Bout 2 Mai Shiranui
Real Bout Bout 2 Billy Kane
Unlimited Survival Mode Time
Highlight Survival Mode, hold Start + Triangle and press Circle.


 King of Fighters KYO

All Characters
Complete the Asia Chapter with Kyo at Level 10. Then, highlight Chris at Character Selection screen and press L1 + L2 + R1 + R2.


 King's Field

Beat the Last Bosses
When fighting your Father and Seth, use your Flash Magic and Strafe Left. You should be able to beat them without getting killed.


 Kitchen Pank

Unlock All Levels
At the Level Selection screen, hold Circle + X + Triangle + Square + L1 + L2 + R1 + R2 on Controller Two and press Down, Down, Right.
99 Lives
At the Level Selection screen, hold L2 + R2 on Controller Two and press Up, Down, Left, Right. Then hold L1 + R1 on Controller Two and press Right, Left, Down. Now release the buttons and press Up.
All Damage Takes 1 Point
At the Level Selection screen, hold L1 + R1 on Controller Two and press Triangle, X, Square, Circle. Then, hold L2 + R2 on Controller Two and press Circle, Square, X. Release the buttons and press Triangle.
Invincibility in Caves
At the Level Selection screen, press R2, R2, L2, L2, L2, R1(7x), L2, L2, L2, R2, R2, R2, R1(7x) on Controller Two.
Refill Energy
Pause the game and press Up, Up, Down, Down, Square, Circle, Square, Circle, L1, R1 on Controller Two.
Rocket Potato
Pause the game and press R1, L2, R2, L1, Left, Right, Up on Controller Two.
Padapada Potato
Pause the game and press R1, L2, R2, L1, Left, Right, Down on Controller Two.
Fuwafuwa Potato
Pause the game and press R1, L2, R2, L1, Left, Right, Circle on Controller Two.
Jumping Potato
Pause the game and press R1, L2, R2, L1, Left, Right, Triangle on Controller Two.
Ice Potato
Pause the game and press R1, L2, R2, L1, Left, Right, Square on Controller Two.
Marine Potato
Pause the game and press R1, L2, R2, L1, Left, Right, X on Controller Two.


 KKND: Krossfire

Start on Last Mission with the Evolved
Password: KQULLZ
Start on Last Mission with the Surivors
Password: GTH6JZ
Start on Mission 7 with the Series 9
Password: MHICYZ


 Klona

Level Select
Pause gameplay and press X, L1, L2, R2, R1, X, Square, Circle.


 Klonoa


 Knight and Baby


 Knockout Kings

Box as a Bear
At the Main Menu, press Right + Square, Right + Triangle, Right + Circle, Right + X. Then select any boxer.
Big Head Mode
At the Main Menu, press Left + Circle, Left + Triangle, Left + Square, Left + X.
Regain Energy
Between fights, when given a choice to hit the heavy or speed bag, hold L1 + L2 + R1 + R2.
Taunt Opponent
Press R1 + R2 + X during a match.
Easy Victory
Knock your opponent down in Career Mode while simultaneously pressing Start. Choose to lose the fight and if timed correctly, the loss will be placed on your opponent.
MegaBoxer
In Career Mode, create a boxer with the name psirules. Exit out to the Main menu, then load the boxer. He will have 100% of everything, 7'5'' and 250 pounds.


 Knockout Kings 2000

Extra Fighters
At the Boxer Creation screen, enter any of the following names to fight as that fighter. Then, at the Pre-Fight Ranking screen, press Circle to save the boxer:
JERMAINE DUPRI
Q TIP
O
GARGOYLE
MARC ECKO
TIM DUNCAN
MARLON WAYANS
ED MAHONE
ROSWELL
SHMACKO
Mini Boxers
At the Options screen, view the Cyber Athlete video. Then enter Career Mode and enter MINIME as a name. To return to normal, enter RESETPASS.


 Konami Antiques: MSX Collection Volume 1

TwinBee Mode in Gradius
On the Game Menu, highlight "Gradius", hold Select, then choose that game.


 Krazy Ivan

Level Select
First, start a normal game. Then pick Russia at the mission choice screen. After choosing Russia, press Right, Left, Down, X.


 Kula World

Extra Levels
Beat all 150 regular levels, then select 1P from the Main Menu, and select The Final option that appears to play the extra levels.
Cheat Mode
During gameplay, press L1 + L2 + R1 + R2 + Select on Controller Two.
Temporary Invincibility
During gameplay, press R1, Circle, Triangle, Square.
30,000 Extra Points
During gameplay, press Square, Up, Down, L2, R1, Triangle, X, Triangle.
Bonus Level
During gameplay, press Triangle, Up, Triangle, L2, L1, L2, Square, X.
Toggle Motion Blur Effect
During gameplay, press Right, Circle, L2, Circle, R1, Circle, Square, Circle, Right, Down, L1, R2.


 Kurin-Pa!

View Ending
During the duration of the "Now Loading" screen with the image of all the characters, hold Start + Select on Controllers One and Two. Then, press Select, Left, Right, or Square.