diff --git a/Engine.c b/Engine.c
index 0229fa8..06bcb7f 100644
--- a/Engine.c
+++ b/Engine.c
@@ -122,12 +122,22 @@ void interact()
           case L_BUTTON:
             bookMark--;
             if (bookMark == -1)
-              bookMark = 1;
+              bookMark = 9;
+            while (!spellKnowledge[bookMark])
+            {
+              bookMark--;
+            }
             break;
           case R_BUTTON:
             bookMark++;
-            if (bookMark == 2)
+            if (bookMark == 10)
               bookMark = 0;
+            while (!spellKnowledge[bookMark])
+            {
+              bookMark++;
+              if (bookMark == 10)
+                bookMark = 0;
+            }
             break;
           case PAUSE_BUTTON:
             pausemenu();
diff --git a/extern.h b/extern.h
index 91b2d8e..f71ce3b 100644
--- a/extern.h
+++ b/extern.h
@@ -18,7 +18,7 @@ extern int kaosFlag;
 extern int spellFlag;
 
 extern long long int savestate;
-extern int spellKnowledge;
+extern int spellKnowledge[10];
 extern int bookMark;
 
 extern Room* menuBG;
diff --git a/main.c b/main.c
index 1cb3c24..47962da 100644
--- a/main.c
+++ b/main.c
@@ -50,7 +50,7 @@ Room* menuBG = NULL;
 Mix_Music* menuBGM = NULL;
 
 long long int savestate = 2;
-int spellKnowledge = 2;
+int spellKnowledge[10] = {1,1,0,0,0,0,0,0,0,0};
 int bookMark = 0;
 
 Room** mapData = NULL;