From: http://worthplaying.com/article/2014/5/16/news/92336/
Basically:
1) "Buy" the 9 free titles today (links at the link). Get 900 coins ($9 credit).
2) Use 699 coins ($6.99) to buy GTA: San Andreas.
3) You have 201 coins ($2.01) left over plus you get an additional 2000 coins ($20) for buying GTA.
Net result = free 2201 coins ($22.01) as credit to use at the Appstore.
This works because you're stacking promos, one of which is only valid for today.
Note that the version of GTA:SA is Kindle/FireTV only, so if you don't have a Kindle or FireTV you can't play it, but the coin credit works on pretty much all the Android apps on the Appstore.
Basically:
1) "Buy" the 9 free titles today (links at the link). Get 900 coins ($9 credit).
2) Use 699 coins ($6.99) to buy GTA: San Andreas.
3) You have 201 coins ($2.01) left over plus you get an additional 2000 coins ($20) for buying GTA.
Net result = free 2201 coins ($22.01) as credit to use at the Appstore.
This works because you're stacking promos, one of which is only valid for today.
Note that the version of GTA:SA is Kindle/FireTV only, so if you don't have a Kindle or FireTV you can't play it, but the coin credit works on pretty much all the Android apps on the Appstore.