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Depends if its a 3DS Action Replay or not. If it isn't then no, If it is then yes.
The original action replay nor the action replay dsi work on the 3ds. There is no current action replay for the 3ds at the moment but my thoughts are that there will be one soon.
no
No, it does not.
No, it will not work
NO.
You need an Action Replay 3DS, other versions won't work on it - note that it is built to work on regular DS games, there isn't a device for actual 3DS games yet.
eventually the 3DS will be hacked and R4 and action replay will come out.
A 3DS action replay has never been announced by the people who made the DS action replay.
Yes you can get DS codes on a Action Replay 3DS.
There is currently no action replay 3ds, but there is an action replay dsi that works for the 3ds being sold only in the UK. I bought mine on ebay.
Answer: Action Replay does work for the 3DS console, but as of right now (24 July 2013) no 3DS games are compatible with the Action Replay 3DS due to hacking problems. You can still use it on regular DS games but not on the current 3DS games. To sum up my answer the answer is yes and no.