DOC

Sudoku Solver (Odin + Raylib 6) — TODO

Last updated: 2026-08-10

9x9 grid, themes (light/dark), navigation (mouse, arrows, hjkl/wasd, Tab blocks)
Number entry, clear cell, conflict highlight (row/col/box)
Lock/unlock toggle (Ctrl+Shift+L), clear unlocked (Ctrl+Shift+C)
Exit confirmation, monospaced fonts, locked cell visuals
Package refactor (root main.odin, src: collection, Game state, events/render/...)
Feature parity after refactor
Cleanup pass (thickness, fonts.destroy, imports, orchestrator, etc.)
Backtracking solver (Alt+S); tested on NYT easy/hard and blank board

board_has_any_conflict at start of solve (reject illegal givens; fix impossible test)
Skip/limit empty-board unit test if too heavy
log.info at start of each test
Merge dev → master when ready

Save / Load puzzles
- Ctrl+S / Ctrl+O
- Simple text format (human-editable preferred)
- dirty flag; warn on exit if unsaved
- optional: warn if unsolvable before save (solve on a copy)
Wire solver polish from cleanup above into mainline tests

Undo / Redo
- History stack of board (+ locked)
- Persistent undofile (Neovim-style) keyed to puzzle path
Pencil marks / candidates
Print / export
- PNG (easiest)
- SVG (clean print)
- PDF (later)
Share string (81 chars 0-9) to clipboard
Settings (themes, warning toggles, "don't show again")
Text-editable puzzle library under assets/puzzles/
- Named boards in a simple file format
- Optional: VS Code / Neovim helpers to author puzzles