Every grid on this page is produced from a seed and a rule, so we know precisely which square is the odd one before you ever see it. Scroll down for the reveal.
Odd One Out A grid of identical arrows with exactly one impostor. The answer is generated from the puzzle data before the picture is drawn, so there is no argument about where it is.
Odd One Out A ten by ten grid where one symbol has been altered by a single small change. Considerably harder than the arrow version, and still guaranteed to have exactly one answer.
Visual Sequence A visual sequence where a single transformation is applied at every step. The fifth panel is computed from the rule, not chosen, so exactly one of the four options can be right.
Maze Generated with a recursive backtracker, then solved independently by a search algorithm to prove a route exists. No dead ends that loop, no unreachable corners.
