Ways to make the game more interesting (apart from challenges)

Thing with challenges is lot have a lot of IMO unnecessary and nonsensical rules, presumably to make them more difficult because they are made by people who only play challenges and do so all the time. So I tend to just take challenge rules as a guideline, its much more fun that way.

Although there are a couple of challenges that are so insanely complex I still haven't figure out how to actually play them so I can decide what rules are necessary.