Old Maid (283)

Instruction:

Each box in the grid contains an image. Each image, except one, appears in two boxes. Find the box that contains the image that appears only once. Images can be rotated but not reflected.

Reference: WPF (1)

Examples:

WPF Puzzle GP 2016 - Round 2 Casual (77)

WPF Puzzle GP 2016 - Round 5 Casual (73)

WPF Puzzle GP 2017 - Round 1C (40)