Stuck. 10 minutes staring at the screen with a forehead like a cattlegrid, whispering "Comeoncomeoncomeoncomeon" to yourself. An hour backtracking to the start of the level - to the start of the game - for something you might've missed. Then, slowly but suddenly, like a Magic Eye picture coming into focus, the solution dawns.
That's your Eureka Moment - a tribute to the clever-clogs developer who magicked up the crafty, logical, satisfying puzzle that almost had your brain beat.
Here are CVG's 20 best 'gotcha' moments on Wii and DS: