About Hard Mode
Start with 8 pictures and only 4 seconds to take your mental snapshot — observation training under real pressure.
Good for: teens, adults, brain-training, competitive players.
About the Wizard of Oz Theme
L. Frank Baum's 1900 book is fully in the public domain. Follow the yellow brick road through a deck of scarecrows, emerald palaces, tornadoes and friendly lions — drawn from the original novel, not any later film adaptation.