Using DeSmuME Action Replay Codes
Action Replay cheat codes are the most common way to apply cheat codes to your DS games in DeSmuME.
In this example, we will use an Action Replay cheat code, which unlocks all the Retro courses in Mario Kart DS.
First of all, go to the menu option ‘Tools -> Cheats -> List’.
This will take you to the cheats list section in DeSmuME.
Next, click the ‘Action Replay’ button and you will see the below window pop up.
It is here you will enter your Action Replay code and a description for it. I personally find it best to just enter the name of the game and a brief note as to what the cheat code is for.
Click the ‘Add’ button once you have entered the cheat code details and you will see your cheat code details appear in the cheats list.
Next, make sure the cheat code you wish to activate has its box checked. This will ensure the cheat is active when you go to your game.
We can see in the below picture that our Mario Kart – Unlock all retro courses cheat code has worked!
If your code does not seem to work, go back and double-check you have entered it correctly and also whether you have selected internal or Action Replay.
it is also worth checking that you have the correct cheat code for the version/region of the game you are playing as occasionally, cheat codes may differ slightly if there are different versions of the games.