How Does Mina's Trials of Whim Work?
These are quest based trials and not ranked. There are four categories - Easy, Normal, Hard and Inferno.
There are also special categories of quests - Male Units Only, 5* or Less and Cost 20 or Less
You go to a separate screen and do quests. You need to clear 100% before moving to the next one. Once you have completed all quests for each of the categories you are move onto the next level of difficulty.
You are awarded prizes for completing the categories however, only one set of prize can be claimed once. So, if you complete all stages in Easy, the prize for Easy is only given on the first completion.
The cooldown is 10 minutes between each normal quest and 15 minutes for Ex Quest. This cool down isn't shared with normal quests.
Inferno quests have a 15 minute cool down between them.
The deploy limit is 3 of your units and 2 of your allies.