Odd One Out
Levels
Levels
A grid of tiles in one colour, with a single tile a shade off. Find it before the clock runs out. Eight rounds make a stage, and you have three lives: a wrong pick or a timeout costs one, and running out ends the stage.
It gets harder in two directions at once. The grid grows, so there is more to search, and the difference between the odd tile and the rest narrows until it sits at the edge of what an eye can separate. The rounds are generated rather than authored, so a stage number is the same puzzle for everyone.