# Pinball

> A 3D pinball table that runs entirely in the browser. An independent reimplementation of the
> published physics and conventions of a pinball machine - not of any commercial machine.

Site: https://pinball.skillsafe.ai/

## What it is

Pinball, the game, in real 3D: an inclined playfield, a spring plunger, three top rollover lanes,
a pop bumper nest, two slingshots, two 3-inch flippers over a drain with an inlane and an outlane
either side, a ramp that climbs to a raised deck, a wireform that returns the ball to the right
inlane, a three-target drop bank, a lock saucer and three-ball multiball, and a plumb-bob tilt.

No commercial machine's playfield, artwork, rules or trade dress is reproduced. The layout, shot
names, scoring and art are this app's own.

## What is unusual about the physics

- The ball is on an INCLINED PLANE. Gravity splits into a pull toward the drain and a press onto
  the wood, and a freely rolling ball accelerates at g sin(pitch) / (1 + 2/5).
- A ball leaving the plunger or a flipper SLIDES before it ROLLS, with a closed-form transition.
- The POP BUMPERS ARE SOLENOIDS. A position switch fires a coil, so the impulse is set by the
  coil and not by the approach speed: the slowest ball measured leaves about ten times faster
  than it arrived. No restitution model can do that.
- The FLIPPER IS A TORQUE-DRIVEN ROTATING BODY with its own moment of inertia, so a tip strike
  leaves nearly four times faster than a base strike at the same bat rate.
- TILT IS A PHYSICAL PENDULUM hanging through a ring, not a nudge counter. Nudges that land in
  step with its swing add; nudges that land against it cancel.

## How it was verified

An event-driven analytic solver (closed-form contact times, with a Ferrari quartic root solver)
checked against the fixed-step integrator; the playfield pitch recovered from a track of emitted
ball positions alone; energy accounting while rolling; and six controls that are wrong by
construction and are required to fail. Every number printed on the page is re-measured from the
engine by the page harness.

## Pages

- / : the table, the help panel, the mechanism notes, the limits list and the credits
- /CREDITS.txt : sources with URLs, what is sourced vs derived vs calibrated, and the corrections
- /LICENSE.txt : MIT

## Privacy

Client-side only. No network requests, no CDN, no model, no analytics. Your best score and your
machine setup are kept in this browser's local storage and nowhere else.