All Specs Open Game/Lab

Overfitting vs Underfitting Explorer - Mini Spec

Kind: lab Difficulty: medium Session: 7-12 min Last reviewed: 2026-02-13

  • bias-variance
  • regularization
  • polynomial

Asset Budget

  • Initial transfer target: 360 KB
  • Interactive transfer target: 1350 KB
  • Runtime RAM target: 180 MB
  • GPU texture target: 72 MB

Overview

Fit polynomial models (degree 1-12) to noisy data, compare train vs test loss, and explore L2 regularization.

Learning Lens

Focus on bias-variance, regularization, polynomial and how local actions shape global behavior.

Controls

Controls are provided by page-level buttons/inputs and support keyboard + pointer/touch where implemented.

Core Loop

Initialize state, process user input, update simulation/model state, and render metrics for immediate feedback.

Scoring and Metrics

Primary score/loss metrics are shown in each page HUD or metrics panel and should remain stable across resets.

Failure States

Failure is either explicit run termination (arcade style) or numerical/logic divergence in labs. Recovery is via reset.

Determinism and Randomness

Manifest flag: uses_randomness=true. Pages with randomness should expose seeded reset behavior via TWGame hooks.

Instrumentation Contract

Expose compact JSON-safe metrics through TWGame.setInspector(() => ({ ... })) and keep payload lightweight.

Accessibility Notes

  • Keep focus-visible styles enabled for all interactive controls.
  • Keep status text in polite live regions where metrics update rapidly.
  • Preserve keyboard parity for core interactions.
  • Validate controls on narrow mobile widths (~390px).

Asset Packs

Required Packs

  • core-ui
  • labs-ui

Optional Packs (after_start)

  • Cosmetic and non-critical assets should remain deferred until after first playable moment.

Largest Single Asset

  • Declared unique asset: games/labs/overfitting/index.html

Test Checklist

  • Load page and verify no console errors.
  • Run one full interaction cycle (play/train/solve).
  • Verify reset works without page reload.
  • Verify keyboard-only interaction for primary controls.
  • Toggle inspector with I and confirm payload updates.
  • Check mobile viewport (~390px width).
  • Validate reduced-motion behavior if animations are present.
  • Validate Back to Games and Specs navigation links.