diff --git a/FightSystem_12/src/de/steamwar/fightsystem/utils/ArrowStopper_12.java b/FightSystem_12/src/de/steamwar/fightsystem/utils/ArrowStopper_12.java
index e4855ee..f4bf992 100644
--- a/FightSystem_12/src/de/steamwar/fightsystem/utils/ArrowStopper_12.java
+++ b/FightSystem_12/src/de/steamwar/fightsystem/utils/ArrowStopper_12.java
@@ -26,6 +26,6 @@ public class ArrowStopper_12 {
 
     @SuppressWarnings("deprecation")
     static int blockToId(Block block){
-        return block.getTypeId() << 4 + block.getData();
+        return block.getTypeId();
     }
 }
diff --git a/FightSystem_Main/src/de/steamwar/fightsystem/utils/ArrowStopper.java b/FightSystem_Main/src/de/steamwar/fightsystem/utils/ArrowStopper.java
index 9fcc647..f838eaf 100644
--- a/FightSystem_Main/src/de/steamwar/fightsystem/utils/ArrowStopper.java
+++ b/FightSystem_Main/src/de/steamwar/fightsystem/utils/ArrowStopper.java
@@ -25,18 +25,24 @@ import de.steamwar.fightsystem.FightSystem;
 import de.steamwar.fightsystem.states.FightState;
 import de.steamwar.fightsystem.states.StateDependent;
 import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.Material;
 import org.bukkit.block.Block;
+import org.bukkit.block.BlockFace;
 import org.bukkit.entity.AbstractArrow;
 import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
 import org.bukkit.scheduler.BukkitTask;
 
 import java.util.Collection;
 import java.util.EnumSet;
+import java.util.HashMap;
 import java.util.Set;
 
 public class ArrowStopper implements StateDependent {
 
     private BukkitTask task;
+    private static final HashMap<Entity, Location> LAST_LOCATION = new HashMap<>();
 
     public static void init() {
         if(Config.ArrowTechhiderCollision == -1)
@@ -51,8 +57,16 @@ public class ArrowStopper implements StateDependent {
         for (Entity entity : arrows) {
             if(entity.getTicksLived() > Config.ArrowTechhiderCollision)
                 continue;
-            if(Config.HiddenBlocks.contains(blockToId(entity.getLocation().getBlock())))
+            if(!LAST_LOCATION.containsKey(entity))
+                LAST_LOCATION.put(entity, ((Player) ((AbstractArrow) entity).getShooter()).getEyeLocation());
+            int distance = (int) Math.ceil(entity.getLocation().toVector().distance(LAST_LOCATION.get(entity).toVector()));
+            try {
+                checkBlock(entity.getFacing().getOppositeFace(), entity.getLocation().getBlock(), distance, entity.getLocation().getBlockY() - LAST_LOCATION.get(entity).getBlockY());
+            } catch (TechHiddenBlock techHiddenBlock) {
                 entity.remove();
+            }
+            LAST_LOCATION.remove(entity);
+            LAST_LOCATION.put(entity, entity.getLocation());
         }
     }
 
@@ -69,6 +83,7 @@ public class ArrowStopper implements StateDependent {
     @Override
     public void disable() {
         task.cancel();
+        LAST_LOCATION.clear();
     }
 
     private static int blockToId(Block block){
@@ -83,4 +98,19 @@ public class ArrowStopper implements StateDependent {
                 return ArrowStopper_15.blockToId(block);
         }
     }
+
+    private void checkBlock(BlockFace face, Block block, int i, int lastdown) throws TechHiddenBlock {
+        Bukkit.getOnlinePlayers().forEach(player -> player.sendBlockChange(block.getLocation(), Material.RED_STAINED_GLASS.createBlockData()));
+        if(Config.HiddenBlocks.contains(blockToId(block)))
+            throw new TechHiddenBlock();
+        if(lastdown != 0) {
+            boolean negativ = lastdown < 0;
+            BlockFace toFace = negativ?BlockFace.UP:BlockFace.DOWN;
+            checkBlock(face, block.getRelative(toFace), i, lastdown + (negativ?1:-1));
+        }
+        if(i != 0 && Math.abs(lastdown) < i)
+            checkBlock(face, block.getRelative(face), i - 1, lastdown);
+    }
+
+    private class TechHiddenBlock extends Throwable {}
 }