Keyboard controls
Use Tab to reach the game’s slider and buttons. Arrow keys make small slider adjustments; Enter locks in a guess when the slider is focused. The − / + buttons offer another way to resize. Visible focus outlines show the active control.
Touch and mouse
Resize with the slider or drag sideways on the board. Vertical scrolling remains available on a phone. You can use the buttons when dragging is inconvenient.
Measurements as text
Objects have text names, dimension labels and measurement notes. The slider announces the estimate and reference ratio. The reveal provides textual feedback and a score rather than relying only on colours.
Motion and timing
The interface respects reduced-motion preferences. Daily, Unlimited and category practice have no timer. Survival is explicitly timed and has its own rules; choose an untimed mode when needed.
A visual estimation activity
The central task depends on judging a drawing’s scale. Text controls and measurements improve access, but do not make visual estimation equivalent for every visitor. The measurement library and comparison facts remain available as text. If a control or page prevents access, use the contact form to describe the issue.