Sébastien QUEROLandClaude Opus 5.5
451464f7c6
Port forced movement (turn delays, bumps, ice, currents, pits), dynamic return warps, elevators, Surf, Cut, Strength and cycling rules, working map blocks with changeblock/changemapblocks, and the remaining NPC movement types and movement commands. Add tileset animation from the ROM's command tables, grass sprite priority and special map palettes; room decorations with ownership, the bedroom PC and save migration; and Key Items access to the Bicycle. Fourteen original-engine traces compare positions, facing, actors, event flags and scripted poses. Tile animation matches original VRAM for four tilesets, and LoadMapPals matches 192 palette cases. skyfall_top now keeps the $60 sprite offset its step function leaves behind. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
5.4 KiB
Crystal
A native web port of Pokémon Crystal, translated from PRET's Game Boy disassembly. The game runs in TypeScript and reads graphics, maps, sprites and dialogue from the user's own ROM. No original game assets are included.
Current milestone: from the opening to Route 30. Play in a minimal Crystal-style interface with Game, Savegames, Map, Pokédex, Link and Friends tabs. The native canvas fills the play area, and the live local map follows your position. Save, export and import work now. Pokédex, Link and Friends show their planned scope without placeholder data.
Walk around your home, the town and its buildings at the original walking speed. Mom gives you the Pokégear and asks the day of the week. The teacher stops you from leaving town. Your rival shoves you away from the lab window. Professor Elm introduces his errand, and you choose Chikorita, Cyndaquil or Totodile. The Pokémon's picture and stats come from your ROM, and you can nickname it. Elm's aide then gives you a Potion. These scenes run the game's own event scripts and movement data, with native choices and naming.
With a Pokémon, head west along Route 29 to Cherrygrove City. Wild Pokémon appear in the grass and battle you with their original moves. The route has ledges, signs, an item ball and a Berry tree that regrows daily. Townspeople wander and look around as in the original. In Cherrygrove, the Guide Gent gives a tour, the Poké Mart buys and sells items, the Pokémon Center nurse heals your party, and a whiteout returns you to the last Pokémon Center you entered.
North of Cherrygrove, Route 30's trainers battle you. Bug Catcher Don spots you from a distance and walks over; Youngster Mikey battles when you talk to him. Each sends out two Pokémon, and beaten trainers remember you. The Berry house gives a Berry, and a Potion is hidden on the route.
Mr. Pokémon gives you the Mystery Egg, and Professor Oak gives you the Pokédex. Your rival challenges you in Cherrygrove on the way back, and Elm's aide gives you Poké Balls. Back on Route 29, the Dude shows you how to catch Pokémon. From then on, open PACK in a wild battle to throw a Poké Ball. Caught Pokémon join your party, and you can give them a nickname.
Use Start or Select for Key Items, including the Bicycle when owned. The bedroom PC lets you arrange owned decorations, and the poster opens the Town Map.
Route 31 and beyond, PC storage, full party and bag menus, other items in battle and audio are still being ported. Catching with six Pokémon in your party needs the PC and is refused for now. Unported neighboring areas appear at the edges but cannot be entered yet.
Run
Requires Node.js 22.12 or newer.
npm ci
npm run dev
Open the printed local URL, choose a name/character and select your uncompressed English US/Europe revision 1.1 ROM (.gbc, 2 MiB). Its checksum is verified locally. ROMs are never uploaded or stored in browser storage; select yours again after reloading to resume.
Use onscreen controls, or focus the game screen and use arrows to move, X to interact and X / Z to continue dialogue. In choices, Up / Down change the answer, X confirms and Z answers No. Sessions save every 10 seconds and when paused. Switching apps pauses play. Download a backup before clearing browser data.
Native saves are separate from emulator snapshots and cartridge .sav files. Saving during a scene keeps the progress from before it, so the scene replays after loading. Time of day follows the device clock; the weekday you give Mom is kept as an offset from the device's weekday. The tile counter measures in-game movement, not real-world steps.
Reference emulator
During development, open /reference.html to run the original game for comparison. It has separate saves and does not run inside the native player. Reference tools and the emulator are excluded from the default build.
npm run build # Native application in dist/
npm run check:release # Check the native distribution
npm run build:reference # Optional reference in dist-reference/
Serve dist/ through an HTTPS static host, or use npm run preview locally. Subdirectory hosting is supported with npm run build -- --base=/Crystal/. Use HTTPS from another device; ROM verification and save locking require a secure context.
Development
npm test
npx playwright install chromium webkit
npm run test:e2e
npm run check:vendor
Local-ROM tests use Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc at the root, or CRYSTAL_ROM_PATH. They skip when absent; no test downloads a ROM. Game files, private reference builds and gameplay screenshots must remain ignored.
The full port plan covers remaining game systems, save slots, the world map, Pokédex, internet Link, friends and optional mobile step support for egg hatching. See the architecture and routine map and verification for module boundaries and reference checks.
References: PRET documentation, wiki and source. The development reference uses binjgb under its MIT license; see provenance.
Independent project. Not affiliated with Nintendo or Game Freak.