Collect ALL the artifacts in the indicated section to unlock the corresponding secret level.

Unlock Young Indy Level:
Collect ALL of the artifacts in Raiders Of The Lost Ark.

Unlock Ancient City Level:
Collect ALL of the artifacts in Temple Of Doom.

Unlock Warehouse Level:
Collect ALL of the artifacts in The Last Crusade.

These codes are entered exactly the same as any other cheat code in the game except to get these you have to have brought the game from the corresponding seller.

Unlock Belloq (Circuit City Preorder) - VE029L

Unlock Mola Ram (Gamestop Preorder) - FJUR31

Unlock Toht (Wal-Mart Preorder) - 13NS01

Unlock Character Treasure (Best Buy Preorder) All Enemys Drop Studs - VIES2R

Unlock Super Slap (Target Preorder) starts with a Zero - 0P1TA5

Entering any of the following codes on the blackboard in the Math classroom (2nd door on the left in the main hallway) at Barnet College will unlock the corresponding option at the 'Extras' menu where you then have to buy it. Characters, items and features unlocked like this can be turned off from the 'Pause' menu.

Characters

Unlock Barranca 04EM94

Unlock Belloq (Desert) - CHN3YU

Unlock Belloq (Jungle) - TDR197

Unlock Belloq (Priest) - VEO29L

Unlock Boxer - 8246RB

Unlock British Officer - VJ5TI9

Unlock British Troop - DJ5I2W

Unlock British Troop Commander - B73EUA

Unlock Captain Katanga - VJ3TT3

Unlock Chatterlal - ENW936

Unlock Chucin - 3NK48T

Unlock Colonel Dietrich - 2K9RKS

Unlock Colonel Vogel - 8EAL4H

Unlock Dancing Girl - C7EJ21

Unlock Desert Digger - 12N68W

Unlock Desert Enemy Officer - 2MK45O

Unlock Desert Masked Bandit - N48SF0

Unlock Desert Monkey Man - 3RF6YJ

Unlock Desert Soldier - 4NSU7Q

Unlock Desert Swordsman - 1MK4RT

Unlock Donovan - 3NFTU8

Unlock Dr. Schneider (Desert) - JSNRT9

Unlock Dr. Schneider (Officer) - VMJ5US

Unlock Enemy Bazookaman - S93Y5R

Unlock Enemy Bazookaman - MK83R7

Unlock Enemy Butler - VJ48W3

Unlock Enemy Communications officer - 1MF94R

Unlock Enemy Guard - VJ7R51

Unlock Enemy Guard (Nepal) - YR47WM

Unlock Enemy Officer - 572E61

Unlock Enemy Pilot - B84ELP

Unlock Fedora - V75YSP

Unlock First Mate - 0GIN24

Unlock Grail Knight - NE6THI

Unlock Hovitos Tribesman - H0V1SS

Unlock Indiana Jones (Officer) - VJ85OS

Unlock Indiana Jones Disguised - 4J8S4M

Unlock Jungle Guide - 24PF34

Unlock Kaokan - WMO46L

Unlock Kazim (Desert) - 3M29TJ

Unlock Kazim (Venice) - NRH23J

Unlock Laoche - 2NK479

Unlock Maharaja - NFK5N2

Unlock Major Toht - 13NS01

Unlock Mola Ram - FJUR31

Unlock Pankot Assassin - 2NKT72

Unlock Pankot Guard - VN28RH

Unlock Punjabi Dignitary - KD48TN

Unlock Punjabi Village Elder - 4682E1

Unlock Sherpa Brawler - VJ37WJ

Unlock Sherpa Gunner - ND762W

Unlock Slave Child - 0E3ENW

Unlock Thuggee - VM683E

Unlock Thuggee Chatterlal - CNH4RY

Unlock Thuggee Priest - T2R3F9

Unlock Thuggee Slavedriver - VBS7GW

Unlock Willie DJ - VK93R7

Unlock Willie Pajamas - MEN4IP

Unlock Wuhan - 3NSLT8


Various

Unlock Artifact Detector - VIKED7

Unlock Beep Beep - VNF59Q

Unlock Character Treasure - VIES2R

Unlock Disarm Enemies - VKRNS9

Unlock Disguises - 4ID1N6

Unlock Fast Build - V83SLO

Unlock Fast Dig - 378RS6

Unlock Fast Fix - FJ59WS

Unlock Fertilizer - B1GW1F

Unlock Ice Rink - 33GM7J

Unlock Parcel Detector - VUT673

Unlock Poo Treasure - WWQ1SA

Unlock Regenerate Hearts - MDLP69

Unlock Secret Characters - 3X44AA

Unlock Silhouettes - 3HE85H

Unlock Scream - VN3R7S

Unlock Super Slap - 0P1TA5

Unlock Treasure x2 - VM4TS9

Unlock Treasure x4 - VLWEN3

Unlock Treasure x6 - V84RYS

Unlock Treasure x8 - A72E1M

Unlock Treasure x10 - VI3PS8

Unlock Treasure Magnet - H86LA2

During gameplay find Luke Skywalker, Princess Leia, C-3PO, R2-D2 and Chewbacca and Han Solo will become a playable option in Free Play mode.