In CoC, the problems that randomly appear are often of varying difficulty. However, the user does not know in advance whether the problem is super easy or more complex. I suggest displaying an indicator which states the difficulty of the problem. At least, it could be defined from past users who were confronted to it. Also, in hard cases, maybe some bonus time (like 10% more time) could be added, or removed when the issue is super easy.
One other feature I’d like to have, is a hint of the solution of the problem. This would be useful, especially after the battle, when I failed to have the solution and no user is willing to share it’s own.