The app
A mark is hidden in one cell of a quiet grid. Before you tap, say whether you think that place is it, or is not it. When your sense matches the outcome, that tap is counted as Right or Wrong at the bottom of the page.
I sense this place will be
Tap a cell when you have a sense of the mark.
A curve of the last 50 will appear here.
Play a few rounds, then see how you compare with chance.
Hunch asks which color. Beacon asks where. A point still means your sense matched the outcome: you said Right and tapped the hidden mark, or you said Wrong and missed it. A 3 × 3 field is a different chance than a 4 × 4, the way four colors are a different chance than eight.