I saw an app for $2.99 that had 1200 tactics problems. I can no longer find this app. I am thinking that it was removed from the app store. I also read online about an app with the same description, but I could not find the app name in the app store.
I am thinking of paying $7.99 for the full shredder to get the extra 1100 tactics problems, so that I can have them on my trip.