Board Thread:Questions and Answers/@comment-1848500-20161011195134/@comment-24659969-20161012040836

Yes, they are not a one time rewards. They can drop multiple times but you only get one of them at a time. If you used treasure radar, you will also only still get 1 of them.

The stage is intended to be a special reward-stage like all those other weekly power-up and rare ticket drop stages. With 30 energy cost and an accumulative of 8% chance you will get something = It takes literally 12 times (360 energy) to have acrued 96% drop rate which is same like one of those weekly stages