diff --git a/.vscode/settings.json b/.vscode/settings.json
index 3850c1e..cf7570e 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -25,6 +25,8 @@
         "unistd.h": "c",
         "pthread.h": "c",
         "maeth.h": "c",
-        "music.h": "c"
+        "music.h": "c",
+        "inventory.h": "c",
+        "invfcts.h": "c"
     }
 }
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 6d73e15..88a0c02 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ test: bin/back
 mem: bin/back
 	valgrind --leak-check=full ./bin/back
 
-bin/back: obj/main.o obj/generation.o obj/display.o obj/proj.o obj/entities.o obj/bullets.o obj/menus.o obj/inventory.o obj/music.o obj/maeth.o obj/move.o obj/base.o obj/hash.o
+bin/back: obj/main.o obj/generation.o obj/display.o obj/proj.o obj/entities.o obj/bullets.o obj/menus.o obj/invFcts.o obj/inventory.o obj/music.o obj/maeth.o obj/move.o obj/base.o obj/hash.o
 	mkdir -p bin
 	$(CC) $(FLAGS) $^ $(LFLAGS) -o $@
 
@@ -27,6 +27,7 @@ obj/move.o: src/move.c
 obj/base.o: src/base.c
 obj/proj.o: src/proj.c
 obj/inventory.o: src/inventory.c
+obj/invFcts.o: src/invFcts.c
 obj/music.o: src/music.c
 obj/maeth.o: src/maeth.c
 obj/menus.o: src/menus.c
diff --git a/bin/back b/bin/back
index 8a8284a..23f4718 100755
Binary files a/bin/back and b/bin/back differ
diff --git a/obj/invFcts.o b/obj/invFcts.o
new file mode 100644
index 0000000..f1558f4
Binary files /dev/null and b/obj/invFcts.o differ
diff --git a/obj/inventory.o b/obj/inventory.o
index 82f4878..6430416 100644
Binary files a/obj/inventory.o and b/obj/inventory.o differ
diff --git a/obj/main.o b/obj/main.o
index 1c1186c..4215332 100644
Binary files a/obj/main.o and b/obj/main.o differ
diff --git a/src/invFcts.c b/src/invFcts.c
new file mode 100644
index 0000000..04ca240
--- /dev/null
+++ b/src/invFcts.c
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <math.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <termios.h>
+#include <limits.h>
+#include <time.h>
+
+#include "hash.h"
+#include "base.h"
+#include "display.h"
+#include "inventory.h"
+#include "invFcts.h"
+
+void shoot(float dtime) {
+    for(int l = 0; l < Lines; l++) {
+        for(int c = 0; c < Cols; c++) {
+            if(playerInventory->data[l][c]->itm->id == 1 && playerInventory->data[l][c]->count > 0) {
+                
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/invFcts.h b/src/invFcts.h
new file mode 100644
index 0000000..8035d89
--- /dev/null
+++ b/src/invFcts.h
@@ -0,0 +1,6 @@
+#ifndef INV_HH
+#define INV_HH
+
+void shoot(float dtime);
+
+#endif
\ No newline at end of file
diff --git a/src/inventory.c b/src/inventory.c
index dcec9fc..37ba381 100644
--- a/src/inventory.c
+++ b/src/inventory.c
@@ -14,12 +14,15 @@
 #include "hash.h"
 #include "base.h"
 #include "display.h"
+#include "invFcts.h"
 #include "inventory.h"
 
 inventory* playerInventory;
 const int Lines = 9;
 const int Cols = 3;
 
+item* itemList;
+
 void inv_init() {
     playerInventory = malloc(sizeof(inventory));
     playerInventory->lines = Lines;
@@ -28,15 +31,94 @@ void inv_init() {
     for(int k = 0; k < Lines; k++) {
         playerInventory->data[k] = malloc(sizeof(stack)*Cols);
         for(int l = 0; l < Cols; l++) {
-            playerInventory->data[k][l] = NULL;
+            playerInventory->data[k][l] = malloc(sizeof(stack));
+            playerInventory->data[k][l]->count = 0;
+        }
+    }
+    itemList = malloc(sizeof(item)*128);
+
+    build_itemList();
+}
+
+void build_itemList() {
+    itemList[0].name = "gun";
+    itemList[0].id = 0;
+    itemList[0].maxCount = 1;
+    itemList[0].maxDur = 100;
+    itemList[0].texID = 0;
+    itemList[0].onCollect = NULL;
+    itemList[0].onUse = &shoot;
+
+    itemList[1].name = "gunAmmo";
+    itemList[1].id = 1;
+    itemList[1].maxCount = 256;
+    itemList[1].maxDur = 1;
+    itemList[1].texID = 0;
+    itemList[1].onCollect = NULL;
+    itemList[1].onUse = NULL;
+}
+
+// return value = success
+bool inv_addItem(int id, float dtime) {
+    const char* name = itemList[id].name;
+    for(int l = 0; l < Lines; l++) {
+        for(int c = 0; c < Cols; c++) {
+            if(
+                (playerInventory->data[l][c]->itm->name == name && playerInventory->data[l][c]->count > 0) &&
+                playerInventory->data[l][c]->count < playerInventory->data[l][c]->itm->maxCount
+            ) {  
+                // stack exists and is not full
+                playerInventory->data[l][c]->count += 1;
+                if(playerInventory->data[l][c]->itm->onCollect != NULL) {
+                    (*playerInventory->data[l][c]->itm->onCollect)(dtime);
+                }
+                return true;
+            }
+        }
+    }
+    for(int l = 0; l < Lines; l++) {
+        for(int c = 0; c < Cols; c++) {
+            if(playerInventory->data[l][c]->count == 0) {
+                // empty spot
+                playerInventory->data[l][c]->count = 1;
+
+                playerInventory->data[l][c]->itm = &(itemList[id]);
+                playerInventory->data[l][c]->itm->durability = playerInventory->data[l][c]->itm->maxDur;
+
+                if(playerInventory->data[l][c]->itm->onCollect != NULL) {
+                    (*playerInventory->data[l][c]->itm->onCollect)(dtime);
+                }
+                return true;
+            }
+        }
+    }
+    return false;
+}
+
+void useItem(int line, int col, float dtime) {
+    if(playerInventory->data[line][col]->count > 0 && playerInventory->data[line][col]->itm->onUse != NULL) {
+        (*playerInventory->data[line][col]->itm->onUse)(dtime);
+        if(playerInventory->data[line][col]->itm->maxCount == 1) {
+            // unstackable
+            playerInventory->data[line][col]->itm->durability -= 1;
+            if(playerInventory->data[line][col]->itm->durability == 0) {
+                playerInventory->data[line][col]->count = 0;
+            }
+        } else {
+            // stackable
+            playerInventory->data[line][col]->count -= 1;
         }
     }
 }
 
 void inv_destroy() {
     for(int k = 0; k < Lines; k++) {
+        for(int l = 0; l < Cols; l++) {
+            free(playerInventory->data[k][l]);
+        }
         free(playerInventory->data[k]);
     }
     free(playerInventory->data);
     free(playerInventory);
+    free(itemList);
 }
\ No newline at end of file
diff --git a/src/inventory.h b/src/inventory.h
index 7fd1fda..835e360 100644
--- a/src/inventory.h
+++ b/src/inventory.h
@@ -3,8 +3,11 @@
 
 typedef struct item {
     const char* name;
+    int id;
     int maxCount;
     int texID;
+    int durability; // 1 if its a stackable item
+    int maxDur;
 
     void (*onCollect)(float dtime);
     void (*onUse)(float dtime);
@@ -22,8 +25,16 @@ typedef struct inventory {
     int cols;
 } inventory;
 
+inventory* playerInventory;
+const int Lines;
+const int Cols;
 // -------------- //
 void inv_init();
+void build_itemList();
+
+bool inv_addItem(int id, float dtime);
+void useItem(int line, int col, float dtime);
+
 void inv_destroy();
 
 #endif
\ No newline at end of file