It's Centred That is a small interactive game by UK design agency Supremo — you're shown ten shapes with a dot placed somewhere inside and have to judge, purely by eye, whether the dot is truly centered.
It's less a reference resource than a genuinely useful eye-training exercise — optical centering, where something looks centered versus where it mathematically is, is a real skill designers rely on constantly, and this makes you practice it directly.
Good for a five-minute break or as a fun way to show junior designers why optical alignment isn't the same as mathematical alignment.
It's a novelty, not a tool — there's no scoring history and no explanation of the correct answer afterward, nothing to actually apply back to your work beyond the exercise itself.
Test your eye and judge whether dots are in the middle of shapes.