No invincibility cheat exists for Call of Duty 3 on Wii. The game has **no cheat code system**—no console, no button combos, no unlockable cheats menu.
| Difficulty | Tips |
|---|---|
| Easy | More health, generous checkpoints, aim assist high. Start here. |
| Normal | Use **cover religiously** (Z on Nunchuk). Lean (Z+B) to peek. Flank with squad commands (D-pad). |
| Veteran | One-shot kills. Memorize spawn points. Use **smoke grenades** + **sprint** to advance. Quick-save doesn't exist—checkpoints only. |