Can you create a personal daily event in which you place Wally (Waldo if in the US i think) onto one of the maps.. His location changes each day and is different per player account. Upon tapping him 1/1 times you get a wondrous trinket..
I only suggest this, as I was inspired on how exciting it is to try to tap on a target in the overcrowded maps ... Please don't make Waldo/Wally a ghost target thou... we have enough of them