diff --git a/solitaire_core/src/klondike_adapter.rs b/solitaire_core/src/klondike_adapter.rs
index 9114e96..fdaacfa 100644
--- a/solitaire_core/src/klondike_adapter.rs
+++ b/solitaire_core/src/klondike_adapter.rs
@@ -3,7 +3,9 @@
 //! [`KlondikeAdapter`] is a pure helper namespace for:
 //! - building [`KlondikeConfig`] from Ferrous settings
 //! - translating between local and upstream types
-//! - applying Ferrous-specific scoring policy on top of upstream defaults
+//!
+//! Ferrous-specific scoring policy (the win-time bonus) lives in
+//! [`crate::scoring`], not here.
 //!
 //! All `From` / `TryFrom` conversions between `solitaire_core` product types and
 //! upstream `card_game` / `klondike` types live here so that the product modules
@@ -14,11 +16,11 @@ use klondike::{
     SkipCards, Tableau,
 };
 
-/// Bridges `solitaire_core` game config and scoring to the upstream `klondike` crate.
+/// Bridges `solitaire_core` game config to the upstream `klondike` crate.
 ///
 /// This type is intentionally zero-sized: it does not carry mutable runtime
-/// state, and exists only as a namespace for configuration, conversion, and
-/// scoring helpers.
+/// state, and exists only as a namespace for configuration and conversion
+/// helpers.
 #[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
 pub struct KlondikeAdapter;
 
@@ -81,12 +83,3 @@ pub fn skip_cards_from_count(skip: usize) -> Option<SkipCards> {
         _ => None,
     }
 }
-
-/// Time bonus added to the score on a win: `700_000 / elapsed_seconds`.
-/// Returns 0 when `elapsed_seconds` is 0 to avoid division by zero.
-pub fn compute_time_bonus(elapsed_seconds: u64) -> i32 {
-    if elapsed_seconds == 0 {
-        return 0;
-    }
-    (700_000u64 / elapsed_seconds).min(i32::MAX as u64) as i32
-}
diff --git a/solitaire_core/src/lib.rs b/solitaire_core/src/lib.rs
index 8655f83..41fc988 100644
--- a/solitaire_core/src/lib.rs
+++ b/solitaire_core/src/lib.rs
@@ -2,6 +2,7 @@ pub mod achievement;
 pub mod error;
 pub mod game_state;
 pub mod klondike_adapter;
+pub mod scoring;
 
 // Re-export the upstream types that cross the solitaire_core API boundary so
 // downstream crates (engine, wasm) can import from one place without a direct
diff --git a/solitaire_core/src/scoring.rs b/solitaire_core/src/scoring.rs
new file mode 100644
index 0000000..54e73e3
--- /dev/null
+++ b/solitaire_core/src/scoring.rs
@@ -0,0 +1,15 @@
+//! Ferrous-specific scoring policy layered on top of upstream `klondike`.
+//!
+//! Upstream [`klondike::KlondikeStats::score`] owns the per-move point values
+//! (move-to-foundation, flip-up bonus, recycle penalty, etc.). The functions
+//! here are the Ferrous Solitaire house rules that upstream has no opinion on —
+//! currently just the win-time bonus shown in the win modal.
+
+/// Time bonus added to the score on a win: `700_000 / elapsed_seconds`.
+/// Returns 0 when `elapsed_seconds` is 0 to avoid division by zero.
+pub fn compute_time_bonus(elapsed_seconds: u64) -> i32 {
+    if elapsed_seconds == 0 {
+        return 0;
+    }
+    (700_000u64 / elapsed_seconds).min(i32::MAX as u64) as i32
+}
diff --git a/solitaire_engine/src/win_summary_plugin.rs b/solitaire_engine/src/win_summary_plugin.rs
index 25fe070..388c5cf 100644
--- a/solitaire_engine/src/win_summary_plugin.rs
+++ b/solitaire_engine/src/win_summary_plugin.rs
@@ -12,7 +12,7 @@
 
 use bevy::prelude::*;
 use solitaire_core::game_state::GameMode;
-use solitaire_core::klondike_adapter::compute_time_bonus;
+use solitaire_core::scoring::compute_time_bonus;
 use solitaire_data::AnimSpeed;
 
 use crate::achievement_plugin::display_name_for;