Board Thread:Tips, Tricks, and Questions/@comment-165.21.106.130-20130711093246/@comment-70.31.72.8-20130715054430

The grabs are just a gamble, spending 50 coins on 1 spin wont guarentee you that you will get it, but for the one time pop ups there is no chance of getting 1 puzzle piece, you'll get a full monster no matter what but either you'll get a Special, Rare, Super, Ultra and Epic.