Deep Field

• The two plates alternate on their own. Watch for the point that changes position.
• Click or tap the star you think moved.
• Keyboard only: arrow keys steer a reticle, Enter marks it, and holding Escape slows the reticle to one pixel a step for fine work.
• A wrong mark costs a second and a half, never a life.
• Each plate adds stars, shortens the blink and shrinks the shift. The shift never falls below three pixels.
• Leaving the tab pauses the game, and the clock stops with it.

This is how Pluto was found. In 1930 Clyde Tombaugh sat at a blink comparator, flicking between two photographic plates of the same sky taken nights apart, looking for the single point that had shifted against a field of thousands that had not. It took him months. The same method caught thousands of asteroids and comets, and it is still the shape of how moving objects are separated from fixed ones. The game is the method: the field is generated, the mover is real, and the only instrument is your attention.

1. 1.0.0 2026-08-16
   • First playable. Seeded fields, keyboard reticle, pointer and touch, local save with export.
   • Fairness proven by gate rather than by eye: across 240 generated fields exactly one star moves, and across 200 fields the mover is on-plate in both positions.
   • Difficulty runs from 90 stars with an 11 px shift to 520 stars with a 3 px shift; every dial clamps.
   • Star field draws from one baked glow sprite rather than a gradient per star per frame.