diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Challenges.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Challenges.java
index 7c5394c8e..61d6d1cc3 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Challenges.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Challenges.java
@@ -30,6 +30,8 @@ public class Challenges {
 	public static final int DARKNESS			= 32;
 	public static final int NO_SCROLLS		    = 64;
 
+	public static final int MAX_VALUE           = 127;
+
 	public static final String[] NAME_IDS = {
 			"no_food",
 			"no_armor",
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Preferences.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Preferences.java
index deaa64fc2..7ee43dccd 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Preferences.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/Preferences.java
@@ -55,30 +55,53 @@ enum Preferences {
 		}
 		return prefs;
 	}
+
+	int getInt( String key, int defValue ) {
+		return getInt(key, defValue, Integer.MIN_VALUE, Integer.MAX_VALUE);
+	}
 	
-	int getInt( String key, int defValue  ) {
+	int getInt( String key, int defValue, int min, int max ) {
 		try {
-			return get().getInt( key, defValue );
+			int i = get().getInt( key, defValue );
+			if (i < min || i > max){
+				put(key, defValue);
+				return defValue;
+			} else {
+				return i;
+			}
 		} catch (ClassCastException e) {
 			ShatteredPixelDungeon.reportException(e);
+			put(key, defValue);
 			return defValue;
 		}
 	}
 	
-	boolean getBoolean( String key, boolean defValue  ) {
+	boolean getBoolean( String key, boolean defValue ) {
 		try {
 			return get().getBoolean(key, defValue);
 		} catch (ClassCastException e) {
 			ShatteredPixelDungeon.reportException(e);
+			put(key, defValue);
 			return defValue;
 		}
 	}
+
+	String getString( String key, String defValue ) {
+		return getString(key, defValue, Integer.MAX_VALUE);
+	}
 	
-	String getString( String key, String defValue  ) {
+	String getString( String key, String defValue, int maxLength ) {
 		try {
-			return get().getString( key, defValue );
+			String s = get().getString( key, defValue );
+			if (s.length() > maxLength) {
+				put(key, defValue);
+				return defValue;
+			} else {
+				return s;
+			}
 		} catch (ClassCastException e) {
 			ShatteredPixelDungeon.reportException(e);
+			put(key, defValue);
 			return defValue;
 		}
 	}
diff --git a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/ShatteredPixelDungeon.java b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/ShatteredPixelDungeon.java
index c5f413204..4e2495aad 100644
--- a/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/ShatteredPixelDungeon.java
+++ b/core/src/main/java/com/shatteredpixel/shatteredpixeldungeon/ShatteredPixelDungeon.java
@@ -365,7 +365,7 @@ public class ShatteredPixelDungeon extends Game {
 	}
 
 	public static int musicVol(){
-		return Preferences.INSTANCE.getInt( Preferences.KEY_MUSIC_VOL, 10 );
+		return Preferences.INSTANCE.getInt( Preferences.KEY_MUSIC_VOL, 10, 0, 10 );
 	}
 	
 	public static void soundFx( boolean value ) {
@@ -382,7 +382,7 @@ public class ShatteredPixelDungeon extends Game {
 	}
 
 	public static int SFXVol() {
-		return Preferences.INSTANCE.getInt( Preferences.KEY_SFX_VOL, 10 );
+		return Preferences.INSTANCE.getInt( Preferences.KEY_SFX_VOL, 10, 0, 10 );
 	}
 	
 	public static void brightness( int value ) {
@@ -393,7 +393,7 @@ public class ShatteredPixelDungeon extends Game {
 	}
 	
 	public static int brightness() {
-		return Preferences.INSTANCE.getInt( Preferences.KEY_BRIGHTNESS, 0 );
+		return Preferences.INSTANCE.getInt( Preferences.KEY_BRIGHTNESS, 0, -2, 4 );
 	}
 
 	public static void language(Languages lang) {
@@ -431,7 +431,7 @@ public class ShatteredPixelDungeon extends Game {
 	}
 	
 	public static int lastClass() {
-		return Preferences.INSTANCE.getInt( Preferences.KEY_LAST_CLASS, 0 );
+		return Preferences.INSTANCE.getInt( Preferences.KEY_LAST_CLASS, 0, 0, 3 );
 	}
 
 	public static void challenges( int value ) {
@@ -439,12 +439,12 @@ public class ShatteredPixelDungeon extends Game {
 	}
 
 	public static int challenges() {
-		return Preferences.INSTANCE.getInt( Preferences.KEY_CHALLENGES, 0 );
+		return Preferences.INSTANCE.getInt( Preferences.KEY_CHALLENGES, 0, 0, Challenges.MAX_VALUE );
 	}
 
 	public static void quickSlots( int value ){ Preferences.INSTANCE.put( Preferences.KEY_QUICKSLOTS, value ); }
 
-	public static int quickSlots(){ return Preferences.INSTANCE.getInt( Preferences.KEY_QUICKSLOTS, 4); }
+	public static int quickSlots(){ return Preferences.INSTANCE.getInt( Preferences.KEY_QUICKSLOTS, 4, 0, 4); }
 
 	public static void flipToolbar( boolean value) {
 		Preferences.INSTANCE.put(Preferences.KEY_FLIPTOOLBAR, value );