If you have been on a purchasing spree on games for your 3DS recently you might be in luck, today Nintendo has started the 'So Many Games' promotion in which if you have 3 titles from the list of 8 below, you can download a fourth one for free!
The eight games included in the promotion are:
So if you have three of those titles and would like a fourth then all you need to do is register them on your 3DS. Details can be found here. Currently the promotion is only for most of Europe but hopefully it will spread soon to more regions.
This seems like a pretty good deal to me and everybody likes free stuff. A promotion like this might have actually enticed me to try and get into Monster Hunter, unfortunately my 3DS got stolen last year. No free games for me!
There's no need to rush as you have until June to do this, let me know in the comments what game you'd want for free.