Kyuubi says:

Are there any effects, for instance any game card data being messed up or deleted by useing action replay?

08/08/2007 texas

MrWiiman says:

It can sometimes crash your games. But thats all im aware of.

08/08/2007 USA

desi says:

And often if you save, the data is corrupted because Action Replay and Game Genie etc. work by editing memory.

08/08/2007 Sydney

SilentOne says:  

damn i hope my game dosent crash.... i have a damn good data im getting AR soon....

08/08/2007 Sydney, NSW, Australia

Lynamo says:

I have not had any problems with the action replay ds. The worst thing that happend is the game crashed but I never got any data erased so I would say its mostly safe as long as you dont do anything stoopid like saving in a tree for pokemon ds or something like that.

08/15/2007 I live on earth (that clear it up for ya)