diff --git a/src/billy_objects.rs b/src/billy_objects.rs
index f133028..b422b43 100644
--- a/src/billy_objects.rs
+++ b/src/billy_objects.rs
@@ -16,7 +16,7 @@ pub trait GenericObject {
     fn add_materiel(&self, in_type: &CharacteristicType) -> i32;
 }
 
-#[derive(Debug, Serialize, Deserialize)]
+#[derive(Debug, Serialize, Deserialize, Hash, Eq, PartialEq, Clone)]
 pub enum Weapons {
     Sword,
     Lance,
@@ -24,7 +24,7 @@ pub enum Weapons {
     Bow,
 }
 
-#[derive(Debug, Serialize, Deserialize)]
+#[derive(Debug, Serialize, Deserialize, Hash, Eq, PartialEq, Clone)]
 pub enum Equipments {
     Chainmail,
     CookingPot,
@@ -32,7 +32,7 @@ pub enum Equipments {
     MedicKit,
 }
 
-#[derive(Debug, Serialize, Deserialize)]
+#[derive(Debug, Serialize, Deserialize, Hash, Eq, PartialEq, Clone)]
 pub enum Tools {
     Fourche,
     Dagger,
@@ -40,7 +40,7 @@ pub enum Tools {
     SackOfGrain,
 }
 
-#[derive(Debug, Serialize, Deserialize)]
+#[derive(Debug, Serialize, Deserialize, Hash, Eq, PartialEq, Clone)]
 pub enum Objects {
     Weapons(Weapons),
     Equipments(Equipments),
@@ -164,7 +164,11 @@ impl GenericObject for Tools {
 
 impl GenericObject for Objects {
     fn add_armor(&self) -> u32 {
-        todo!()
+        match self {
+            Objects::Weapons(a) => a.add_armor(),
+            Objects::Equipments(a) => a.add_armor(),
+            Objects::Tools(a) => a.add_armor(),
+        }
     }
 
     fn add_critique(&self) -> u32 {
diff --git a/src/sheet.rs b/src/sheet.rs
index 5bb3ff1..5c924e8 100644
--- a/src/sheet.rs
+++ b/src/sheet.rs
@@ -1,9 +1,26 @@
-use eframe::egui::widgets::DragValue;
-use eframe::egui::Ui;
+use crate::billy_objects::{Equipments::*, GenericObject, Objects, Tools::*, Weapons::*};
+use crate::gui::SheetGui;
+use eframe::egui::{widgets::DragValue, Ui};
 use serde::{Deserialize, Serialize};
+use std::collections::hash_set;
 use std::io::Write as _;
 
-use crate::gui::SheetGui;
+const ALL_OBJECTS: [Objects; 12] = [
+    Objects::Weapons(Sword),
+    Objects::Weapons(Lance),
+    Objects::Weapons(Morgenstern),
+    Objects::Weapons(Bow),
+    Objects::Equipments(Chainmail),
+    Objects::Equipments(CookingPot),
+    Objects::Equipments(PamphletTourist),
+    Objects::Equipments(MedicKit),
+    Objects::Tools(Fourche),
+    Objects::Tools(Dagger),
+    Objects::Tools(RockClimbingKit),
+    Objects::Tools(SackOfGrain),
+];
+
+const MAX_OBJ: usize = 3;
 
 #[derive(Debug, Serialize, Deserialize)]
 pub enum Classe {
@@ -30,11 +47,90 @@ pub struct CharacterSheet {
     stamina: CharacteristicType,
     luck: CharacteristicType,
     skill: CharacteristicType,
+    objects: hash_set::HashSet<Objects>,
     health: u32,
     armor: u32,
     damage: u32,
     glory: u32,
     money: u32,
+    critique: u32,
+    nb_weapons: u8,
+    nb_equipments: u8,
+    nb_tools: u8,
+}
+
+#[derive(Debug)]
+pub struct SheetRuler {
+    pub available_objects: hash_set::HashSet<Objects>,
+}
+
+impl Default for SheetRuler {
+    fn default() -> Self {
+        Self {
+            available_objects: hash_set::HashSet::from_iter(ALL_OBJECTS),
+        }
+    }
+}
+
+impl SheetRuler {
+    fn change_carac(
+        object: &Objects,
+        sheet: &mut CharacterSheet,
+        operation: impl Fn(u32, i32) -> u32,
+    ) {
+        sheet.address_mut().materiel = operation(
+            sheet.address_mut().materiel,
+            object.add_materiel(&sheet.address),
+        );
+        sheet.skill_mut().materiel = operation(
+            sheet.skill_mut().materiel,
+            object.add_materiel(&sheet.skill),
+        );
+        sheet.luck_mut().materiel =
+            operation(sheet.luck_mut().materiel, object.add_materiel(&sheet.luck));
+        sheet.stamina_mut().materiel = operation(
+            sheet.stamina_mut().materiel,
+            object.add_materiel(&sheet.stamina),
+        );
+        sheet.armor = operation(sheet.armor, object.add_armor() as i32);
+        sheet.damage = operation(sheet.armor, object.add_damage() as i32);
+        sheet.critique = operation(sheet.critique, object.add_critique() as i32);
+    }
+    pub fn insert_object(&mut self, sheet: &mut CharacterSheet, object: Objects) -> bool {
+        if self.available_objects.len() >= MAX_OBJ || sheet.objects.contains(&object) {
+            false
+        } else {
+            Self::change_carac(&object, sheet, |a, b| a + b as u32);
+            let remove = self.available_objects.remove(&object);
+            let r = sheet.objects.insert(object.clone()) && remove;
+            if r {
+                match object {
+                    Objects::Weapons(_) => sheet.nb_weapons += 1,
+                    Objects::Equipments(_) => sheet.nb_equipments += 1,
+                    Objects::Tools(_) => sheet.nb_tools += 1,
+                }
+            }
+            r
+        }
+    }
+
+    pub fn erase_object(&mut self, sheet: &mut CharacterSheet, object: Objects) -> bool {
+        if sheet.objects.contains(&object) {
+            Self::change_carac(&object, sheet, |a, b| a - b as u32);
+            let remove = sheet.objects.remove(&object);
+            let r = self.available_objects.insert(object.clone()) && remove;
+            if r {
+                match object {
+                    Objects::Weapons(_) => sheet.nb_weapons -= 1,
+                    Objects::Equipments(_) => sheet.nb_equipments -= 1,
+                    Objects::Tools(_) => sheet.nb_tools -= 1,
+                }
+            }
+            r
+        } else {
+            false
+        }
+    }
 }
 
 pub fn write_sheet(path: &std::path::Path, sheet: &CharacterSheet) -> std::io::Result<()> {
@@ -256,11 +352,16 @@ impl Default for CharacterSheet {
                 materiel: 0,
                 additional: 0,
             }),
+            objects: hash_set::HashSet::default(),
             health: 0,
             armor: 0,
             damage: 0,
             glory: 0,
             money: 0,
+            critique: 0,
+            nb_weapons: 0,
+            nb_equipments: 0,
+            nb_tools: 0,
         }
     }
 }