A hand-drawn window sits on warm paper while color bands sweep past. The top names the color that counts. A light tap scores only when that color sits inside the frame. The wrong color is an empty flick and spends energy; at empty, the page stops. After several matches the asked color changes faster, two bands may travel together, and the frame shakes. Pencil dust is the reply, not decoration stacked at the edge. This is color recognition, not tapping whatever glows. The paper is soft, and the window is narrow.
Flick the crayon window only when the asked color crosses it.