How do you complete the Switcharoo challenge in Meet the Council and the Decisions challenge in Meet the Dwarves?
Switcharoo involves a lot of swapping places with the Ninja in order to take out the three enemy units.
Decisions is actually quite simple. Move the Grenadier up two squares (immediately to the right of the Paladin). Scroll him and attack the Knight. Attack the Knight two more times - the splash damage will take out all the other units.