diff --git a/src/game/card.rs b/src/game/card.rs
index a601cf2..01699c6 100644
--- a/src/game/card.rs
+++ b/src/game/card.rs
@@ -168,7 +168,6 @@ impl EntityCommand for CardIcon {
     }
 }
 
-// TODO: `min_level` field before the card can be offered in the level up menu.
 #[derive(Reflect, Serialize, Deserialize, Clone)]
 pub struct Card {
     pub name: String,
@@ -177,6 +176,15 @@ pub struct Card {
     pub background_key: String,
     #[serde(rename = "icon")]
     pub icon_key: String,
+    /// The earliest level this card will be offered in the level up menu.
+    #[serde(default)]
+    pub min_level: usize,
+    /// The latest level this card will be offered in the level up menu.
+    #[serde(default = "inf")]
+    pub max_level: usize,
+    /// The relative probability of this card being offered in the level up menu.
+    #[serde(default = "one")]
+    pub weight: f64,
 
     #[serde(rename = "play_sfx", default)]
     play_sfx_path: String,
@@ -195,6 +203,10 @@ fn one() -> f64 {
     1.0
 }
 
+fn inf() -> usize {
+    usize::MAX
+}
+
 pub fn card(key: impl Into<String>, active: Option<bool>) -> impl EntityCommand {
     let key = key.into();
 
diff --git a/src/screen/playing/level_up_menu.rs b/src/screen/playing/level_up_menu.rs
index 7923d85..62e9579 100644
--- a/src/screen/playing/level_up_menu.rs
+++ b/src/screen/playing/level_up_menu.rs
@@ -7,11 +7,12 @@ use leafwing_input_manager::common_conditions::action_just_pressed;
 use leafwing_input_manager::prelude::*;
 use pyri_state::extra::entity_scope::StateScope;
 use pyri_state::prelude::*;
-use rand::seq::IteratorRandom as _;
+use rand::prelude::*;
 
 use crate::core::pause::Pause;
 use crate::core::UpdateSet;
 use crate::game::actor::level::up::LevelUp;
+use crate::game::actor::level::Level;
 use crate::game::card::card;
 use crate::game::card::deck::Deck;
 use crate::game::card::deck::IsDeckDisplay;
@@ -183,16 +184,26 @@ fn instructions_container(mut entity: EntityWorldMut) {
 }
 
 fn card_options_container(entity: Entity, world: &mut World) {
-    let config = SystemState::<ConfigRef<CardConfig>>::new(world).get(world);
+    let mut system_state = SystemState::<(
+        ConfigRef<CardConfig>,
+        Query<&Selection, With<IsDeckDisplay>>,
+        Query<&Level>,
+    )>::new(world);
+    let (config, selection_query, level_query) = system_state.get(world);
     let config = r!(config.get());
-    // TODO: Pick cards options from a card pool based on level.
-    let card_keys = config
+    let selection = r!(selection_query.get_single());
+    let level = r!(level_query.get(selection.0));
+    let level = level.current;
+    let card_pool = config
         .card_map
-        .keys()
-        .choose_multiple(&mut rand::thread_rng(), 3)
-        .into_iter()
-        .cloned()
+        .iter()
+        .filter(|(_, card)| card.min_level <= level && level <= card.max_level)
         .collect::<Vec<_>>();
+    let card_keys =
+        r!(card_pool.choose_multiple_weighted(&mut rand::thread_rng(), 3, |(_, card)| card.weight))
+            .into_iter()
+            .map(|(key, _)| (*key).clone())
+            .collect::<Vec<_>>();
 
     world
         .entity_mut(entity)