Traceberry app for iPhone and iPad

In a faraway galaxy, there once was a planet named Planet Berries. Alien monsters lived on this planet and fed on the delicious berries that grew there. The monsters lived happily on their planet for many years, until one day, Planet Berries was hit with an asteroid and was destroyed. All the berries flew away through the galaxy and landed on Planet Earth. These berries found all kinds of shops as good places to hide in, and they became offers and discounts. Only one monster survived the blast, but he was very hungry, so he followed the berries to Planet Earth. He now searches for offers and discounts in the shops, where the bigger the offer, the more satisfied the monster is. Your mission is to help the monster survive by hunting the hidden berries in the mall and feeding him.