diff --git a/build.gradle b/build.gradle
index da94f43d1a..ad166bb43d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,7 +25,7 @@ allprojects {
         appName = 'Mindustry'
         gdxVersion = '1.9.8'
         aiVersion = '1.8.1'
-        uCoreVersion = '36de2b4'
+        uCoreVersion = 'cfc0943'
 
         getVersionString = {
             String buildVersion = getBuildVersion()
diff --git a/core/assets/version.properties b/core/assets/version.properties
index ba0a570c2a..4bc1c15954 100644
--- a/core/assets/version.properties
+++ b/core/assets/version.properties
@@ -1,7 +1,7 @@
 #Autogenerated file. Do not modify.
-#Wed Mar 14 23:06:35 EDT 2018
+#Thu Mar 15 12:56:43 EDT 2018
 version=release
-androidBuildCode=521
+androidBuildCode=523
 name=Mindustry
 code=3.4
 build=custom build
diff --git a/core/src/io/anuke/mindustry/entities/Units.java b/core/src/io/anuke/mindustry/entities/Units.java
new file mode 100644
index 0000000000..be45666659
--- /dev/null
+++ b/core/src/io/anuke/mindustry/entities/Units.java
@@ -0,0 +1,32 @@
+package io.anuke.mindustry.entities;
+
+import com.badlogic.gdx.math.Rectangle;
+import io.anuke.mindustry.entities.units.BaseUnit;
+import io.anuke.mindustry.game.Team;
+import io.anuke.ucore.entities.EntityGroup;
+import io.anuke.ucore.function.Consumer;
+
+import static io.anuke.mindustry.Vars.playerGroup;
+import static io.anuke.mindustry.Vars.unitGroups;
+
+/**Utility class for unit-based interactions.*/
+public class Units {
+
+    public static void allUnits(Consumer<Unit> cons){
+        for(EntityGroup<BaseUnit> group : unitGroups){
+            if(!group.isEmpty()){
+                for(BaseUnit unit : group.all()){
+                    cons.accept(unit);
+                }
+            }
+        }
+
+        for(Player player : playerGroup.all()){
+            cons.accept(player);
+        }
+    }
+
+    public static void getNearbyEnemies(Team team, Rectangle rect, Consumer<Unit> cons){
+
+    }
+}
diff --git a/core/src/io/anuke/mindustry/io/SaveFileVersion.java b/core/src/io/anuke/mindustry/io/SaveFileVersion.java
index 36b38f39f9..38cbdec31a 100644
--- a/core/src/io/anuke/mindustry/io/SaveFileVersion.java
+++ b/core/src/io/anuke/mindustry/io/SaveFileVersion.java
@@ -23,16 +23,4 @@ public abstract class SaveFileVersion {
 
     public abstract void read(DataInputStream stream) throws IOException;
     public abstract void write(DataOutputStream stream) throws IOException;
-
-    public static void writeString(DataOutputStream stream, String string) throws IOException{
-        stream.writeByte(string.length());
-        stream.writeBytes(string);
-    }
-
-    public static String readString(DataInputStream stream) throws IOException{
-        int length = stream.readByte();
-        byte[] result = new byte[length];
-        stream.read(result);
-        return new String(result);
-    }
 }
diff --git a/core/src/io/anuke/mindustry/io/versions/Save16.java b/core/src/io/anuke/mindustry/io/versions/Save16.java
index f163b8c581..98b25a20cb 100644
--- a/core/src/io/anuke/mindustry/io/versions/Save16.java
+++ b/core/src/io/anuke/mindustry/io/versions/Save16.java
@@ -65,7 +65,7 @@ public class Save16 extends SaveFileVersion {
         IntMap<Block> map = new IntMap<>();
 
         for(int i = 0; i < blocksize; i ++){
-            String name = readString(stream);
+            String name = stream.readUTF();
             int id = stream.readShort();
 
             map.put(id, Block.getByName(name));
@@ -221,7 +221,7 @@ public class Save16 extends SaveFileVersion {
 
         for(int i = 0; i < Block.getAllBlocks().size; i ++){
             Block block = Block.getAllBlocks().get(i);
-            writeString(stream, block.name);
+            stream.writeUTF(block.name);
             stream.writeShort(block.id);
         }