Closes Quat investigation #1. Today some Klondike deals are unwinnable from the start and the player has no signal that the deal they were given is solvable. A new Settings → Gameplay toggle "Winnable deals only" (default off) makes the engine retry seeds at deal-time until the solver returns Winnable, up to a cap. Solver solitaire_core::solver is a hand-rolled iterative-DFS solver with memoisation on a 64-bit canonical state hash. Move enumeration is priority-ordered: foundation moves first (zero choice when an Ace or rank-up exists), inter-tableau moves second, waste-to-tableau third, stock-draw last. The draw is skipped when the cycle counter shows we've recirculated the entire stock without progress — Klondike's deterministic stock cycle means further draws can't unlock anything new. Two budget knobs (move_budget = 100k, state_budget = 200k by default) cap pathological cases at Inconclusive; the caller treats Inconclusive as "winnable" so the player isn't penalised for the solver giving up. Median solve time is 2 ms; pathological inconclusives top out near 120 ms. Switched from recursive to iterative DFS after a real-deal solve overflowed Rust's default 8 MB thread stack. Behaviour identical; the change is invisible to callers. Pure logic — solitaire_core has no Bevy or I/O. Same input always yields the same SolverResult. Settings Settings.winnable_deals_only is a #[serde(default)] bool; legacy files load to false. SOLVER_DEAL_RETRY_CAP = 50 caps the retry loop. The Settings → Gameplay toggle reads as "Winnable deals only" with a "(may take a moment when on)" caption. Engine integration handle_new_game's seed-selection path now branches on the toggle. When on AND mode is Classic AND no specific seed was requested (daily challenges, replays, and explicit-seed requests bypass the solver), choose_winnable_seed walks seed N, N+1, N+2, … calling try_solve until it finds Winnable or Inconclusive. If the cap is hit without a verdict, the latest tried seed is used so the player always gets a deal rather than spinning forever. 19 new tests (11 solver, 3 settings, 5 engine including the choose_winnable_seed unit). Two ignored bench/scan helpers (solver_bench, find_unwinnable) for ad-hoc profiling. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Solitaire Quest
A cross-platform Klondike Solitaire game written in Rust, with a card-theme system, full progression (XP / levels / achievements / daily challenges), and optional self-hosted sync so your stats follow you across machines.
Features
- Klondike Solitaire — Draw One and Draw Three modes; foundations are unlocked (any Ace lands in any empty slot, the slot then claims that suit)
- Card themes — bundled hayeah/playing-cards-assets default plus user-installable themes (drop a directory under the data dir or import a zip from Settings → Cosmetic)
- Modern HUD — reserved top band keeps cards from crowding the score readout; the action bar auto-fades when the cursor leaves it so it can't compete with the play surface
- Drag feel — every legal drop target is highlighted in green during drag; cards cast a soft drop shadow that lifts when picked up; the stock pile shows a remaining-count chip so you can see how close you are to a recycle
- Keyboard navigation — Tab cycles focus through buttons, arrow keys move within picker rows, Enter activates; works across every modal and the HUD action bar
- Progression — XP, levels, unlockable card backs and backgrounds
- 19 Achievements — including secret ones
- Daily Challenge — server-seeded so every player worldwide gets the same deal
- Leaderboard — opt-in, powered by your own self-hosted server
- Special Modes (unlocked at level 5): Zen, Time Attack, Challenge
- Sync — pull/push stats across devices via a self-hosted server
- Color-blind mode — blue tint on red-suit cards alongside the suit glyph
Building
Prerequisites
- Rust stable toolchain (
rustup install stable) - Linux:
libasound2-dev libudev-dev libxkbcommon-dev - macOS: Xcode Command Line Tools
# Fast development build
cargo run -p solitaire_app --features bevy/dynamic_linking
# Release build
cargo build -p solitaire_app --release
./target/release/solitaire_app
Controls
Every action also has a visible UI button — keyboard shortcuts are optional accelerators.
| Key | Action |
|---|---|
| Left click / drag | Move cards |
| Double click | Auto-move card to its best legal destination |
| Right click | Highlight legal moves for a card |
| Space / D | Draw from stock |
| U | Undo |
| H | Hint (highlight a legal move) |
| N | New game |
| Z | Zen mode |
| G | Forfeit (during pause) |
| Tab / Shift+Tab | Cycle keyboard focus |
| Enter | Activate focused button / auto-complete (when badge is lit) |
| Esc | Pause / dismiss modal |
| F1 | Help / controls |
| F11 | Toggle fullscreen |
| S / A / P / O / L / M | Stats / Achievements / Profile / Settings / Leaderboard / Menu |
Card themes
The default theme ships embedded in the binary, so the game runs
self-contained with no external assets. To install another theme, drop a
directory containing a theme.ron manifest plus 53 SVG files (52 faces +
1 back) under the platform data dir's themes/ folder, or import a zip
from Settings → Cosmetic. The picker chip lights up the moment a new
theme is registered. Themes are SVG-based, so they rasterise cleanly at
whatever resolution the window happens to be.
Sync Server (optional)
To sync stats across machines, run the self-hosted server. See README_SERVER.md for setup instructions.
Once the server is running, open Settings → Sync Backend, enter the server URL and your username, and register an account from within the game.
Running Tests
# All tests (982 passing as of v0.11.0)
cargo test --workspace
# Just game logic (no display required)
cargo test -p solitaire_core -p solitaire_sync -p solitaire_data -p solitaire_server
# Lint
cargo clippy --workspace --all-targets -- -D warnings
Credits
Built on Bevy and the wider Rust ecosystem
(Tokio, Axum, sqlx, Serde, kira, and many more). Card faces come from
hayeah/playing-cards-assets
(MIT, derived from the public-domain vector-playing-cards library); the
default card back is original work; the UI font is FiraMono-Medium (OFL).
All audio is synthesized programmatically by this project. See
CREDITS.md for the full list and license details.
Changelog
See CHANGELOG.md.
License
MIT — see LICENSE.