Alternate clothing
Successfully complete the indicated task to unlock the corresponding item:

Bike shorts: Ride 100 km on a bike.
Black cowboy hat: Give a homeless man spare change in Bullworth.
Black ninja costume: Completely fill your yearbook.
Black skate shoes: Walk at least 50 km.
BMX champion costume: Successfully complete a bike race.
Boxing costume: Successfully complete the Boxing Challenge in Chapter 2.
Burglar mask: Found in a locker on Halloween.
Cheerful reindeer sweater: Found in the school office during the winter.
Crash helmet: Finish in first place in the Kart Race at the Carnival.
Dunce cap: Fail three classes in a row.
Edna mask: Destroy all nineteen tombstones.
Fast food costume: Successfully complete the Burger Joint errand in Bullworth.
Firefighter's helmet: Pull the fire alarm twenty times.
Graduation hat: Successfully complete all five levels in all of your classes.
Gnome costume: Smash all the garden gnomes.
Go Kart: Win all Go Kart races.
Gold suit: Buy all the clothing.
Green ninja costume: Hit targets with projectiles 1,000 times.
Grotto Master costume: Collect all G&G cards.
Incognito hat: Successfully complete Errand #21 near City Hall.
Jimmy's Skeleton Halloween costume: Successfully complete the "The Candidate" mission to unlock the "Halloween" mission.
Orderly uniform: Successfully complete "Finding Johnny Vincent" in Chapter 5.
Pirate hat: Beat up the pirate on the island near the beach house.
Prison uniform: Successfully complete all the detention mini-games.
Pumpkinhead mask: Destroy all 27 pumpkins around the school.
Red ninja costume: Successfully complete the Big Prank task during Halloween.
Rubberband ball: Collect all 75 rubberbands.
Running shorts: Run or walk 40 km.
School mascot costume: Successfully complete the "Nice Outfit" mission in Chapter 4.
Soda hat: Drink 500 sodas.
Tiny swimsuit: Find the preppie with a blue mission on the beach at the beach house and beat his swimming time.
Werewolf mask: Found in a school locker after picking the lock.
Wrestling uniform: Successfully complete Gym 1.

Class completion bonuses
Successfully complete the indicated class to unlock the corresponding bonus:

Art 1: Able to exchange gift for a kiss from a girl
Art 2: 50% health bonus from kissing girls
Art 3: 75% health bonus from kissing girls
Art 4: 100% health bonus from kissing girls
Art 5: Ability to kiss girls without giving gifts

Chemistry 1: Firecrackers available from chemistry set
Chemistry 2: Stink Bombs available from chemistry set
Chemistry 3: Itching Powder available from chemistry set
Chemistry 4: Items produced doubled from chemistry set
Chemistry 5: Chemistry set available all the time

English 1: Apology improved
English 2: Better taunts
English 3: Ability to apologize to prefects improved
English 4: Ability to taunt bullies more effectively and from a distance
English 5: Ability to apologize to police

Gym 1: Headbutt and 3-hit knee groin combo unlocked
Gym 2: Accuracy for slingshot improved
Gym 3: Kneedrop unlocked
Gym 4: Accuracy for slingshot improved
Gym 5: Accuracy for slingshot improved

Photography 1: Black and white camera and small photo album
Photography 2: Yearbook
Photography 3: Large photo album
Photography 4: Color digital camera
Photography 5: Twice as many carnival prize tickets per win

Shop 1: BMX basic
Shop 2: BMX retro
Shop 3: BMX green.
Shop 4: BMX blue
Shop 5: BMX red

Room decorations
Successfully complete the indicated mission or chapter to unlock the corresponding decoration for Jimmy's room at Bullworth:

Artist's set: Successfully complete Class 5 Art.
BMX frame: Successfully complete Class 5 Shop.
Burned school banner: "The Gym Is Burning" mission in Chapter 5.
Football Jersey: Chapter 4.
Greaser Jacket: Chapter 3.
Grim Reaper: "Funhouse Fun" mission in Chapter 4.
Picture of Beatrice: "That Bitch" mission in Chapter 1.
Picture of Lola: "The Tenements" mission in Chapter 3.
Picture of Lola kissing Gordo: "Jealous Johnny" mission in Chapter 3.
Picture of Mandy: "Discretion Assured" mission in Chapter 4.
Picture of Ms. Phillips: Successfully complete Class 5 Photography.
Picture of Pinky: "Carnival Date" mission in Chapter 2.
Picture of Zoe: "Smash It Up" mission in Chapter 5.
Rat in a Jar: "Rats In The Library" mission in Chapter 5.
Russel's shirt: Chapter 1.
Teddy Bear: "Carnival Date" mission in Chapter 2.
Various Chem Plant Signs: Both parts of the "Busting In" mission in Chapter 5.
Venus Flytrap Head: "Weed Killer" mission in Chapter 2.

Girlfriends
Successfully completing the indicated mission to unlock the corresponding girlfriend, which you can then kiss for a health bonus:

Beatrice: "That Bitch" mission in Chapter 1.
Lola: "The Tenements" mission in Chapter 3.
Mandy: "Discretion Assured" mission in Chapter 4.
Pinky: "Carnival Date" mission in Chapter 2.
Zoe: "Smash It Up" mission in Chapter 5.

Easy money
Go to the basketball court anytime after 4:00 p.m. to play the Penalty Shot mini-game. Bet the maximum of $20.00. Go up to the line, then press Circle to jump. Press X to throw while in mid-jump for easy knockdowns. -From: EGHQ and Edward C. Lewis

Easy Faculty Taunts
Go to the Principle's office and taunt the secretary. When she starts to chase you, just run around the desk and continue taunting her (while locked on with L1) for as long as desired. If she grabs you, just tap Triangle(10), or if she is not already irritated, you can just keep apologizing, which also helps your stats. This works for almost all staff -- just run and taunt. -From: EGHQ

Easy yearbook photos
To get a lot of photos in the Yearbook, go to either dormitory, pull the fire alarm, stand by and press Up, then start snapping them as they run by. -From: EGHQ

Fighting multiple opponents
When fighting more than one opponent, sometimes you will get hit from behind. To prevent this, push over as many opponents as you can until there is only one person standing. Beat on him for a short time, then push him over when somebody else gets up. Beat on the person who got up and push them down when others get up. Try to keep as many on the ground as possible while only handling one or two enemies at a time.

Get some itching powder. When you get into a fight, if you need help set your weapon as the itching powder and throw it at one of the people you are fighting. They will start to itch. While they are itching, beat them up. The itching powder should last long enough for you to beat them or at least get their health in the red zone.

Saving others from beatings
To save someone from a beating, grab the attacker(s) by pressing Triangle and throw them far away from the victim -- so they will focus on you, and you will not accidentally hit the victim. -From: EGHQ

Destroying all pumpkins and tombstones
After starting the "Halloween" mission, you can get a bonus for finding and smashing all the pumpkins and tombstones around campus. If you do not find all of them, do not worry. In the next (and last) mission of the chapter, where you go into the basement of the school with Gary, you will get to the boiler room. Inside will be all of the pumpkins you missed in the "Halloween" mission. Kick all of them for an unlockable. Later in the game when you unlock the "Preppie" part of town, go to the asylum. Next to it will be a warehouse, and inside are all of the tombstones you missed.

English Class
The following is a list of the letters you are given in each English Class and the minimum number of words required within the time limit to pass the class:

English Class 1: The letters are "ELMOLW" and you need 7 words to pass the class. Here are words that can be created from those letters: Ell, Elm, Low, Mel, Mew, Mol, Mow, Ole, Owe, Owl, Lowe, Meow, Mewl, Mole, Moll, Well, Mellow.

English Class 2: The letters are "THFSGI" and you need 14 words to pass. Here are words that can be created from those letters: Fig, Fit, His, Hit, Its, Sit, Figs, Fish, Fist, Fits, Gift, Gist, Hits, Sift, Sigh, This, Fight, Gifts, Shift, Sight, Fights.

English Class 3: The letters are "ELISSM" and you need 15 words to pass. Here are words that can be created from those letters: Elm, Ism, Lei, Lie, Mil, Elms, Isle, Isms, Leis, Less, Lies, Lime, Mess, Mile, Mils, Miss, Semi, Sims, Slim, Isles, Limes, Miles, Seism, Semis, Slime, Slims, Smile, Slimes, Smiles.

English Class 4: The letters are "RAOCYN" and you need 19 words to pass. Here are words that can be created from those letters: Any, Arc, Can, Car, Cay, Con, Coy, Cry, Nay, Nor, Oar, Ran, Ray, Roc, Yon, Corn, Cory, Cyan, Narc, Racy, Roan, Yarn, Acorn, Corny, Crony, Rayon, Crayon.

English Class 5: The letters are "DGRAGE" and you need 22 words to pass. Here are words that can be created from those letters: Age, Are, Dag, Ear, Egg, Era, Erg, Gad, Gag, Rag, Red, Aged, Dare, Dear, Drag, Dreg, Egad, Gage, Gear, Grad, Rage, Read, Agger, Grade, Raged, Dagger, Ragged.

Endless Summer Chapter
It is possible to finish the game without 100% in all missions. However, if you watch the end credits you will see that Chapter 6, "Endless Summer", has been unlocked, which allows you can do any missions that you may have missed.

Trent romance
Get flowers from the girls dorm, then talk to Trent. If you talk to him twice, it will bring up the option to give him flowers. When you do so, the lips will appear and you can kiss him. Note: You must complete the first chapter in order to do this.

See the "Bitch" vomit in "That Bitch" mission
Hide in the trash can behind you after you place the stink bomb in "her" locker. When she does not see you, she will vomit and continue to do so as you make your escape. If she catches you before you hide she will run away screaming.

Drive flipped Go-Kart
If you flip your Go-Kart upside down you can still drive around with it and you will not fall out.

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