Everything in the catalog

Customizable typing speed test with many modes, word lists and stats; an account is optional.

Shared analysis boards where you annotate games with comments and variations, alone or with others.

Flash Player emulator demo that plays SWF files you load, preserving old browser games and animations.

Sliding tile puzzle where matching numbers merge until you reach 2048.

Tetris implemented with React, playable with keyboard and with a pause feature.

Builds editable fantasy world maps with states, religions, cultures, burgs and routes; exports to image or data files.

Run TIC-80 fantasy computer carts in the browser, a tiny retro console for homebrew games.

Build branching interactive stories visually as linked passages; works in the browser and exports to HTML.

Play the Snake demo cart on the WASM-4 fantasy console, a 160x160 retro game platform for WebAssembly.

Predicts upcoming Animal Crossing turnip sell prices from the prices you have seen so far in the week.

Lets you paint a pattern on the GitHub contribution graph and produces a script to create matching commits.

Wordle variant for four-character Chinese idioms, with pinyin hints.

Game narrative design tool for mapping branching dialogue and interactive stories as a node graph.

Write D&D-style brews in Markdown and see them laid out like an official book page, ready for print or PDF.

Open-source engine and editor for making and playing tile-based puzzle games.

Editor and player for writing tile-based puzzle games in a simple rule language.

Tiny game maker for small worlds and stories using pixel rooms, tiles and dialogue.

Minesweeper played with emoji tiles in the browser.

CHIP-8 assembler and IDE that runs your program in a built-in emulator, with sprite and audio tools.

Speedcubing timer with WCA-style scrambles, statistics, many puzzle types and training tools.

Clock that shows a quote from literature mentioning the current time.

Texas Hold'em postflop GTO solver that runs in the browser using WebAssembly.

Game Boy emulator for the browser that runs ROMs you load, with a debugger view and WebAssembly speed.

Web interpreter for text adventures that plays Z-machine, Glulx and other story files from a link or upload.