Commander Challenges can be found by tapping on the train which is beneath the Parade Grounds in your Headquarters. Tapping on this will give you 7 different trials, each one able to be done on a specific day of the week. Using the below drop down lists, you can now easily see which challenges offer which rewards, from Bases 1 – 8 per challenger course! This is for all 16 courses across the 7 different trials! Buildings and Research challenges still only have 14 Paths!