Widgets

Small interactive things — games, algorithm playgrounds, useful tools — built into the site.

4 widgets

$ls ./widgets --interactive

>4 loaded · click any card to launch

Rust API · NoSQL Sandbox

build a backend from blocks · fire requests · watch every step

A live, in-browser simulator of a Rust (Axum-style) REST API and its NoSQL store. Edit a JSON-like schema, declare HTTP routes, then compose each handler from blocks — auth, parse, validate, db-read, db-write, asserts, respond. Fire any request from the test console and the engine walks every block in order, mutating the store and producing a response, with the trace pane letting you scrub backward and forward through the entire pipeline.

rustaxumrestnosqlsandboxinteractive

./widgets/sudoku

Sudoku

game

play · hint · animated backtracking solver

Random valid 9x9 puzzles at three difficulties. A hint tool shows every digit that legally fits in the cell you've selected (row + column + 3x3 box). The auto-solver runs the same backtracking pattern as LeetCode 37, animated cell-by-cell so you can watch it try, commit, and backtrack in real time.

gamebacktrackingLeetCode 37

./widgets/algo-viz

Algorithm Visualizer

tool

15 sorts · side-by-side compare · run your own Python

Animated bar-chart visualizer for 15 sorting algorithms with live op-counters and per-algorithm complexity badges. Run two algorithms side-by-side to see why O(n log n) beats O(n^2). Switch tabs to write your own sort in Python — the runtime tracks every read, write and comparison and estimates your algorithm's complexity.

sortingvisualizationpythonpyodide

./widgets/tanks

Tank Battle

game

5 levels · vector tanks · enemy AI · particle FX

A web-native 2D tank battle in the site's blue-glow palette. Five hand-built levels, three enemy AI variants (wander-shoot, chase, sniper) and a teleporting boss on level 5. Swept-AABB collision means no clipping, ray-traced bullets mean no tunneling, and every explosion sprays vector particles. Keyboard or on-screen touch pad.

gamecanvasaiparticles

// note — everything in this section runs entirely in your browser. The Python tab in the algorithm visualizer ships a real CPython runtime via Pyodide (lazy-loaded the first time you open it).