The following are known Action Replay Codes for LEGO Indiana Jones: The Original Adventures on Nintendo DS (NDS).

Game ID: YLJE-35F3C2C5

Press R = Invincible / L = Normal
94000130 feff0000
2213be0a 00000002
d2000000 00000000
94000130 fdff0000
2213be0a 00000000
d2000000 00000000

PRESS SELECT FOR MAX STUD CODES:

SELECT: Max Studs (College)
94000130 fffb0000
0215ac00 0098967f
d2000000 00000000

SELECT: Max Studs & Adventurer Status (In Game)
94000130 fffb0000
0215bc34 0098967f
d2000000 00000000

Press SELECT for 100% Complete
94000130 fffb0000
d5000000 000000ff
c0000000 0000003c
d8000000 0215ef10
d2000000 00000000
94000130 fffb0000
d5000000 000000ff
c0000000 00000002
d8000000 0215ef00
d2000000 00000000