Stardust has no press in it at all. Move a finger, a mouse or an eye-gaze cursor across the black stage and colour follows: a comet of sparks, a chain of big soft lights, a turning trail of stars, a wide painted ribbon, or rings that open and fade. Nothing has to be aimed at, nothing has to be timed, and there is no wrong answer to give — which makes this one of the first activities worth trying with a learner who is still finding out that where they look is doing something.

Everything clears itself within a couple of seconds, and that is the design rather than a shortcut. What is on the screen is always and only where the player has just been, so the answer to “am I doing that?” stays as obvious on the four hundredth look as on the first. If you want the marks to stay and build into a picture, that is a different activity and it has a page of its own.

The trail sings as it travels, pitched by how high on the screen it has reached, so the shape of a movement is audible as well as visible. On a single switch there is no pointer to follow, so the trail walks a gentle looping path of its own and the one big button throws a ring of stardust from wherever it has got to. The stage is never still and never blank, which matters: a black screen whose whole subject is that it reacts must not open as a black screen that does not.

Works with touch, a mouse, a head pointer, a single switch, two-switch scanning, or eye-gaze dwell. Effect intensity, reduced motion, sound and spoken praise are in the app's Settings panel; reduced motion keeps the colour and takes away the travel, so the trail still lands where the player looked without flying. Nothing is uploaded anywhere.