The following are known Action Replay Codes for Serious Sam Advance on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
a2e589f6
3ac5ad29
9b47f6a7
deb5281f

Infinite Lives
259bf53d
9fc5cfe6

Infinite Health
eff56648
d203d012

Infinite Armor
2e19adb9
78b8eb6f

Max Score
fe61180d
7e59f96a