Game
The Chart Room
Pocket Sudoku that inks in stolen treasure maps.
The Chart Room is pocket Sudoku for the browser. You sit at a midnight-gold chart table. Each solved board inks a scrap of a stolen map. Finish the isles and the cache is marked.
Play: /play/chart-room/. First campaign: Widow’s Wake, a Plankwalk voyage told in ciphers instead of letters.
This is the third free JabMed Media game. Plankwalk and Critical Mass already share a hangman spine. A third hangman would have been easy and thin. Here the verb changes: you place numbers, a scrap of chart appears, and the voyage is the hook — not a timer.
The game stays free. Optional studio support helps fund the next chart.
One username
Tap Sign in on the title screen. The same name you use in Plankwalk or Critical Mass carries your charts. Guest play still works on this device. Currencies are not shared.
Finish Widow’s Wake on this device and Plankwalk can read a local Cartographer stamp — Chart Master medal plus a Cartographer title on the main deck. No shared wallet.
How to play
Sudoku rules, pirate table:
- Fill the chart so every row, column, and box holds each digit once.
- Rum Cay is one easy 6×6. Each finished box inks a scrap of the cay.
- Widow’s Reef is six medium 6×6 boards. Each board inks a tile of the wreck.
- Black Wake is one 9×9. Each finished box inks the X, same as Rum Cay.
- Daily Cipher is one shared 9×9 for the UTC day.
You are not racing a clock on the campaign boards. Accuracy is the pressure.
Tools
- Spyglass — reveals a safe cell and says why (only 4 fits here, or 4 can only live in this row). That is a lesson, not a skip button.
- Parrot — pencils notes in the selected box.
- Keyboard: arrows, digits, Backspace, U undo, H hint, N notes.
Chart an isle without Spyglass or Parrot to stamp Dry Ink in the captain’s log. The cabin also keeps scraps, a daily streak, and the weather under the beds (reef creak, wake wind).
Widow’s Wake
| Isle | Boards | What it is |
|---|---|---|
| Rum Cay | One easy 6×6 | Coastline. Boxes ink the cay. |
| Widow’s Reef | Six medium 6×6 | Wreck and sharks. One board, one tile. |
| Black Wake | One 9×9 | The cache. Boxes ink the X. |
The first run is authored. Sail again mints new unique ciphers for the same three isles. Daily Cipher is a nameless scrap that opens box by box — one hard board, one shared date, keep a streak if you want.
The Chart Room stays pirate. The lab floor plan lives in Critical Mass as Protocol Charts, not as Sudoku in teal.
Tips
- On Rum Cay, look at boxes before rows. A finished box inks that scrap.
- On Widow’s Reef, pencil with Parrot when two digits share a line. Do not guess; the boards are built to have one solution.
- Spyglass is for when you are stuck on a why, not when you are bored. Dry Ink is the badge for a clean isle.
- Black Wake and Daily Cipher are 9×9. Open Daily when you have a few minutes, not between doors.
- If you want the Cartographer handshake in Plankwalk, finish the campaign on the same browser / device (or while signed in). The stamp is local studio glue, not a cloud inventory.
Related
- Plankwalk — pirate hangman; reads Cartographer
- Critical Mass — science hangman and Protocol Charts
- Process: Building The Chart Room
- One username for every JabMed game
Credits
Charts and game design: JabMed Media. Map plates: Grok Imagine. Music beds from Plankwalk packs (Suno Pro @JoeyJabs22). Ending push-in on the cache: Higgsfield. Build: Vite / TypeScript. The board is CSS so the digits stay exact.
JabMed Media is a division of JabMed Holdings LLC.
Questions: contact or media@jabmedholdings.com.