+ You want to find a hidden treasure in a labyrinth.  Why do you not use a Best-First Search?
+ You want to find the shortest path from A to B.  Why is BFS more appropriate then DFS?
+ Modelling the Power of Thor as a state machine. the state is a position $(x,y)$, but how do you label the edges from $(x.,y)$?
+ Which four properties do you need to consider when you assess the performance of a algorithm?