Unlock the following cheat options at the "Extras" menu by entering the corresponding codes on the blackboard in the Math classroom at Barnett College:

CHEAT FUNCTION - CHEAT CODE
Artifact Detector - VIKED7
Beep Beep - VNF59Q
Character Treasure [Note 1] - VIES2R
Disarm Enemies - VKRNS9
Disguises - 4ID1N6
Fast Build - V83SLO
Fast Dig - 378RS6
Fast Fix - FJ59WS
Fertilizer - B1GW1F
Ice Rink - 33GM7J
Invincibility - B83EA1
Parcel Detector - VUT673
Poo Treasure [Note 2] - WWQ1SA
Regenerate Hearts - MDLP69
Secret Characters [Note 3] - 3X44AA
Silhouettes - 3HE85H
Super Scream - VN3R7S
Super Slap - 0P1TA5
Treasure x2 - VM4TS9
Treasure x4 - VLWEN3
Treasure x6 - V84RYS
Treasure x8 - A72E1M
Treasure x10 - VI3PS8
Treasure Magnet - H86LA2

Note 1: Killed enemies will drop Studs.

Note 2: Animals will defecate Studs.

Note 3: This code unlocks the following secret playable characters in Free Play mode. Santa in the "Into The Mountains" level; Dancing Girl 2, Thieving Hoodlum 1, and Thieving Hoodlum 2 in the "Shanghai Showdown" level; Enemy Radio Operator in the "Search For King Richard" level; and Graverobber 1 and Gravrobber 2 in the "Young Indy" level.