Lego Indiana Jones: The Original Adventures Cheats

Just go to the bartender and go to code.

You enter codes at Barnett College. It's the 2nd door on the left in the main hallway.
You still have to buy characters unlocked this way, you just get access to them.
Cheats that are unlocked this way are ready to go, they can be turned on from the pause menu.

To unlock these Cheats go to the math room at the university and to the chalk board. If I get enough positive comments on what little I just posted I will post more Cheats.

Enter the following codes on the blackboard in the Math classroom at Barnet College.

1(first go to the articfact room and jump off the gate and you go to the yard) 2(second go to art room and play mutiplayer and kill one charter and when his body is coming back and he there go in and it makes only his body weapon and legs and you could go outside
the art room and get to play with him) 3(go to indy's office and get the 5 treasures to open the holes in the articfact room 4(and go to the articfact room and go to the lever that builds a elephant buy it and then go to the one of knights amor and buy to get about 4,650,464,464 but every thing cost now 3,5493

Bonus levels
Collect all the artifacts in the indicated movie to unlock the corresponding secret level:
Raiders Of The Lost Ark: Young Indy level
Temple Of Doom: Ancient City level
The Last Crusade: Warehouse level

Raining Lego Studs
Get a 100% completion to have Lego Studs rain inside Barnett College.

You enter these codes in the classroom while at the chalkboard and while standing on the red mat

Enter the following codes on the blackboard in the Math classroom at Barnet College.