So, a problem I've had two times now is accidentally selling gold level moves. Sadly, for such an amazing game some very core issues are here. There is no "lock" system for ensuring that prided fighters and moves aren't accidentally sold. Additionally, the interface for the moves has a problem. When you go to upgrade a move the upgrade icon is on the left side. Then when the confirmation screen comes up, the upgrade confirmation is on the right side. Simple, but unintuitive. And problematic. If you're then powering up runes multiple times it's a hiccup that can be heartbreaking if you are tapping based on a normal interface. When you present a player with two options, left should always be yes, or always be no. Alternating these creates an unintuitive interface. Especially for repetitive actions. Solution? Update the interface or even better add a feature for locking runes and characters you don't want to accidentally sell. Hopefully both so you don't have to deal with players sending in requests to rollback accounts or be compensated for accidental errors.