The following are known Action Replay Codes for Tomb Raider: Underworld on Nintendo DS (NDS).
Game ID: YX8E-9B909370
Infinite Health
6223cdec 00000000
b223cdec 00000000
10000046 00000006
d2000000 00000000
Have All Weapons
1203c628 00007100
Thor’s Hammer only...
action
action replay
action replay codes
codes
extra
game id
have all weapons
helheim serpent level
infinite ammo
infinite health
nds
nintendo ds
orbs never charge
pressl+r+select
raider
replay
replay codes
thor’s hammer
tomb
tomb raider
underworld
unlock all stages
us
yx8e-9b909370