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Previously paid Nintendo DS emulator app on Android goes free (DraStic DS)
(www.androidheadlines.com)
This is a most excellent place for technology news and articles.
Bought this a couple of months ago myself that said its probably a good thing it's being open sourced I just have bad timing and bad luck in general when I buy things of the play store.
Just as an example I bought GTA Vice City and a few weeks later my phone updated to 14 and it hasn't loaded or even seen an update since. So yeah avoid that one.