On my android 18 pets must be rescued but on youtube https://www.youtube.com/watch?v=KS0IEWpg6xo only 12 are needed. So there is no way to rescue 18 since only 12 are avaialble.
The plus button and the arrows work fine! But there is no option to change map and play previous levels. And I do not have any idea what happens with the gifts that used to gain at the end of each episode, hopefully I get others from star collection!