diff --git a/deobfuscator-api/src/main/java/dev/xdark/ssvm/classloading/SupplyingClassLoader.java b/deobfuscator-api/src/main/java/dev/xdark/ssvm/classloading/SupplyingClassLoader.java
new file mode 100644
index 0000000..d47c3cb
--- /dev/null
+++ b/deobfuscator-api/src/main/java/dev/xdark/ssvm/classloading/SupplyingClassLoader.java
@@ -0,0 +1,71 @@
+package dev.xdark.ssvm.classloading;
+
+import dev.xdark.ssvm.VirtualMachine;
+import dev.xdark.ssvm.api.MethodInvoker;
+import dev.xdark.ssvm.api.VMInterface;
+import dev.xdark.ssvm.mirror.member.JavaMethod;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.net.URLStreamHandler;
+
+/**
+ * A custom classloader to supply additional content to the {@link VirtualMachine}.
+ * <br>
+ * You will want to install this into the VM and use {@link VMInterface#setInvoker(JavaMethod, MethodInvoker)} on the
+ * providing methods to supply classes and resources.
+ *
+ * @see SupplyingClassLoaderInstaller
+ *
+ * @author Matt Coley
+ */
+public class SupplyingClassLoader extends ClassLoader {
+  public native byte[] provideResource(String name);
+
+  public native byte[] provideClass(String name);
+
+  @Override
+  protected Class<?> findClass(String name) throws ClassNotFoundException {
+    byte[] classBytes = provideClass(name);
+    if (classBytes != null)
+      return defineClass(name, classBytes, 0, classBytes.length);
+    return super.findClass(name);
+  }
+
+  @Override
+  protected URL findResource(String name) {
+    byte[] resourceBytes = provideResource(name);
+    if (resourceBytes != null) {
+      try {
+        return new URL("memory", "", -1, "", new URLStreamHandler() {
+          @Override
+          protected URLConnection openConnection(URL u) {
+            return new URLConnection(u) {
+              private InputStream is;
+
+              @Override
+              public void connect() {
+                // no-op
+              }
+
+              @Override
+              public InputStream getInputStream() {
+                if (is == null) {
+                  is = new ByteArrayInputStream(resourceBytes);
+                }
+                return is;
+              }
+            };
+          }
+        });
+      } catch (MalformedURLException e) {
+        throw new RuntimeException(e);
+      }
+    }
+
+    return super.findResource(name);
+  }
+}
diff --git a/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/context/Context.java b/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/context/Context.java
index f47ba99..641999a 100644
--- a/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/context/Context.java
+++ b/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/context/Context.java
@@ -5,8 +5,6 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
-import dev.xdark.ssvm.VirtualMachine;
-import dev.xdark.ssvm.execution.VMException;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import uwu.narumi.deobfuscator.api.asm.ClassWrapper;
@@ -24,7 +22,7 @@ public class Context {
   private final DeobfuscatorOptions options;
   private final LibraryClassLoader libraryLoader;
 
-  private SandBox sandBox = null;
+  private SandBox globalSandBox = null;
 
   public Context(DeobfuscatorOptions options, LibraryClassLoader libraryLoader) {
     this.options = options;
@@ -35,19 +33,11 @@ public Context(DeobfuscatorOptions options, LibraryClassLoader libraryLoader) {
    * Gets sandbox or creates if it does not exist.
    */
   public SandBox getSandBox() {
-    if (this.sandBox == null) {
+    if (this.globalSandBox == null) {
       // Lazily load sandbox
-      VirtualMachine vm = options.virtualMachine() == null ? new VirtualMachine() : options.virtualMachine();
-      try {
-        this.sandBox = new SandBox(this.libraryLoader, vm);
-      } catch (VMException ex) {
-        LOGGER.error("SSVM bootstrap failed. Make sure that you run this deobfuscator on java 17");
-        SandBox.logVMException(ex, vm);
-
-        throw new RuntimeException(ex);
-      }
+      this.globalSandBox = new SandBox(this);
     }
-    return this.sandBox;
+    return this.globalSandBox;
   }
 
   public DeobfuscatorOptions getOptions() {
diff --git a/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/context/DeobfuscatorOptions.java b/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/context/DeobfuscatorOptions.java
index 39400be..2615cb9 100644
--- a/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/context/DeobfuscatorOptions.java
+++ b/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/context/DeobfuscatorOptions.java
@@ -32,9 +32,7 @@ public record DeobfuscatorOptions(
 
     boolean printStacktraces,
     boolean continueOnError,
-    boolean verifyBytecode,
-
-    VirtualMachine virtualMachine
+    boolean verifyBytecode
 ) {
   public static DeobfuscatorOptions.Builder builder() {
     return new DeobfuscatorOptions.Builder();
@@ -70,8 +68,6 @@ public static class Builder {
     private boolean continueOnError = false;
     private boolean verifyBytecode = false;
 
-    private VirtualMachine virtualMachine = null;
-
     private Builder() {
     }
 
@@ -203,12 +199,6 @@ public DeobfuscatorOptions.Builder verifyBytecode() {
       return this;
     }
 
-    @Contract("_ -> this")
-    public DeobfuscatorOptions.Builder virtualMachine(VirtualMachine virtualMachine) {
-      this.virtualMachine = virtualMachine;
-      return this;
-    }
-
     /**
      * Build immutable {@link DeobfuscatorOptions} with options verification
      */
@@ -240,9 +230,7 @@ public DeobfuscatorOptions build() {
           // Other config
           printStacktraces,
           continueOnError,
-          verifyBytecode,
-
-          virtualMachine
+          verifyBytecode
       );
     }
   }
diff --git a/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/execution/SandBox.java b/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/execution/SandBox.java
index 4faa07f..ce88e2f 100644
--- a/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/execution/SandBox.java
+++ b/deobfuscator-api/src/main/java/uwu/narumi/deobfuscator/api/execution/SandBox.java
@@ -12,84 +12,88 @@
 import dev.xdark.ssvm.invoke.InvocationUtil;
 import dev.xdark.ssvm.memory.management.MemoryManager;
 import dev.xdark.ssvm.mirror.type.InstanceClass;
+import dev.xdark.ssvm.mirror.type.JavaClass;
 import dev.xdark.ssvm.operation.VMOperations;
 import dev.xdark.ssvm.symbol.Primitives;
 import dev.xdark.ssvm.symbol.Symbols;
 import dev.xdark.ssvm.thread.ThreadManager;
 import dev.xdark.ssvm.util.Reflection;
+
+import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.util.List;
 
 import dev.xdark.ssvm.value.InstanceValue;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import uwu.narumi.deobfuscator.api.library.LibraryClassLoader;
+import uwu.narumi.deobfuscator.api.context.Context;
 
 /**
- * A wrapper for {@link VirtualMachine}
+ * A wrapper for {@link VirtualMachine} with some additional features and patches
  */
 public class SandBox {
 
   private static final Logger LOGGER = LogManager.getLogger(SandBox.class);
 
-  private final VirtualMachine virtualMachine;
+  private final VirtualMachine vm;
+  private final Context context;
   private final MemoryManager memoryManager;
   private final SupplyingClassLoaderInstaller.Helper helper;
   private final InvocationUtil invocationUtil;
 
-  public SandBox(LibraryClassLoader loader) {
-    this(loader, new VirtualMachine());
+  public SandBox(Context context) {
+    this(context, new VirtualMachine());
   }
 
-  public SandBox(LibraryClassLoader loader, VirtualMachine virtualMachine) {
-    this.virtualMachine = virtualMachine;
+  public SandBox(Context context, VirtualMachine vm) {
+    LOGGER.info("Initializing SSVM sandbox...");
+    this.context = context;
+    this.vm = vm;
 
     try {
-      this.virtualMachine.initialize();
-      this.virtualMachine.bootstrap();
-      this.memoryManager = virtualMachine.getMemoryManager();
+      this.vm.initialize();
+      this.vm.bootstrap();
+      this.memoryManager = vm.getMemoryManager();
       // Install all classes from deobfuscator context
-      this.helper = SupplyingClassLoaderInstaller.install(virtualMachine, new ClassLoaderDataSupplier(loader));
-      this.invocationUtil = InvocationUtil.create(virtualMachine);
+      this.helper = SupplyingClassLoaderInstaller.install(vm, new ClassLoaderDataSupplier(context.getLibraryLoader()));
+      this.invocationUtil = InvocationUtil.create(vm);
       patchVm();
-    } catch (Exception e) {
-      throw new RuntimeException(e);
+    } catch (VMException ex) {
+      LOGGER.error("SSVM bootstrap failed. Make sure that you run this deobfuscator on java 17");
+      SandBox.logVMException(ex, vm);
+
+      throw new RuntimeException(ex);
+    } catch (IOException ex) {
+      throw new RuntimeException(ex);
     }
+    LOGGER.info("Initialized SSVM sandbox");
   }
 
   private void patchVm() {
     // Some patches to circumvent bugs arising from VM implementation changes in later versions
-    if (virtualMachine.getJvmVersion() > 8) {
+    if (vm.getJvmVersion() > 8) {
       // Bug in SSVM makes it think there are overlapping sleeps, so until that gets fixed we stub
       // out sleeping.
-      InstanceClass thread = virtualMachine.getSymbols().java_lang_Thread();
-      virtualMachine
-          .getInterface()
+      InstanceClass thread = vm.getSymbols().java_lang_Thread();
+      vm.getInterface()
           .setInvoker(thread.getMethod("sleep", "(J)V"), MethodInvoker.noop());
 
       // SSVM manages its own memory, and this conflicts with it. Stubbing it out keeps everyone
       // happy.
-      InstanceClass bits = (InstanceClass) virtualMachine.findBootstrapClass("java/nio/Bits");
+      InstanceClass bits = (InstanceClass) vm.findBootstrapClass("java/nio/Bits");
       if (bits != null) {
-        virtualMachine
-            .getInterface()
+        vm.getInterface()
             .setInvoker(bits.getMethod("reserveMemory", "(JJ)V"), MethodInvoker.noop());
       }
     }
   }
 
-  public static String toString(Throwable t) {
-    StringWriter stringWriter = new StringWriter();
-    PrintWriter printWriter = new PrintWriter(stringWriter);
-    t.printStackTrace(printWriter);
-    return stringWriter.toString();
-  }
-
   /**
    * @see SandBox#logVMException(VMException, VirtualMachine)
    */
   public void logVMException(VMException ex) {
-    logVMException(ex, this.virtualMachine);
+    logVMException(ex, this.vm);
   }
 
   /**
@@ -106,12 +110,12 @@ public static void logVMException(VMException ex, VirtualMachine vm) {
     LOGGER.error(vm.getOperations().toJavaException(oop));
   }
 
-  public VirtualMachine getVirtualMachine() {
-    return virtualMachine;
+  public VirtualMachine vm() {
+    return vm;
   }
 
   public VMInterface getVMInterface() {
-    return virtualMachine.getInterface();
+    return vm.getInterface();
   }
 
   public MemoryManager getMemoryManager() {
@@ -127,38 +131,47 @@ public InvocationUtil getInvocationUtil() {
   }
 
   public Symbols getSymbols() {
-    return virtualMachine.getSymbols();
+    return vm.getSymbols();
   }
 
   public Primitives getPrimitives() {
-    return virtualMachine.getPrimitives();
+    return vm.getPrimitives();
   }
 
   public VMOperations getOperations() {
-    return virtualMachine.getOperations();
+    return vm.getOperations();
   }
 
   public LinkResolver getLinkResolver() {
-    return virtualMachine.getLinkResolver();
+    return vm.getLinkResolver();
   }
 
   public RuntimeResolver getRuntimeResolver() {
-    return virtualMachine.getRuntimeResolver();
+    return vm.getRuntimeResolver();
   }
 
   public Reflection getReflection() {
-    return virtualMachine.getReflection();
+    return vm.getReflection();
   }
 
   public ThreadManager getThreadManager() {
-    return virtualMachine.getThreadManager();
+    return vm.getThreadManager();
   }
 
   public FileManager getFileManager() {
-    return virtualMachine.getFileManager();
+    return vm.getFileManager();
   }
 
   public ExecutionEngine getExecutionEngine() {
-    return virtualMachine.getExecutionEngine();
+    return vm.getExecutionEngine();
+  }
+
+  /**
+   * Gets all classes from {@link Context} that were used by sandbox
+   */
+  public List<JavaClass> getUsedCustomClasses() {
+    return this.vm.getClassStorage().list().stream()
+        .filter(clazz -> this.context.getClasses().containsKey(clazz.getInternalName()))
+        .toList();
   }
 }
diff --git a/deobfuscator-impl/src/test/java/Bootstrap.java b/deobfuscator-impl/src/test/java/Bootstrap.java
index 8ad2e9b..cd3f1aa 100644
--- a/deobfuscator-impl/src/test/java/Bootstrap.java
+++ b/deobfuscator-impl/src/test/java/Bootstrap.java
@@ -1,4 +1,3 @@
-import dev.xdark.ssvm.VirtualMachine;
 import java.nio.file.Path;
 import org.objectweb.asm.ClassReader;
 import org.objectweb.asm.ClassWriter;
@@ -12,10 +11,6 @@ public static void main(String[] args) {
     Deobfuscator.from(
         DeobfuscatorOptions.builder()
             .inputJar(Path.of("work", "obf-test.jar"))
-            .virtualMachine(
-                new VirtualMachine() {
-                  // you can do shit
-                })
             .transformers(
                 // Pick your transformers here
                 () -> new ComposedGeneralFlowTransformer()
diff --git a/deobfuscator-transformers/src/main/java/uwu/narumi/deobfuscator/core/other/impl/zkm/ZelixLongEncryptionTransformer.java b/deobfuscator-transformers/src/main/java/uwu/narumi/deobfuscator/core/other/impl/zkm/ZelixLongEncryptionTransformer.java
index ba43252..410981d 100644
--- a/deobfuscator-transformers/src/main/java/uwu/narumi/deobfuscator/core/other/impl/zkm/ZelixLongEncryptionTransformer.java
+++ b/deobfuscator-transformers/src/main/java/uwu/narumi/deobfuscator/core/other/impl/zkm/ZelixLongEncryptionTransformer.java
@@ -18,9 +18,6 @@
 import uwu.narumi.deobfuscator.api.helper.AsmHelper;
 import uwu.narumi.deobfuscator.api.transformer.Transformer;
 
-import java.util.ArrayList;
-import java.util.List;
-
 /**
  * Decrypts {@code long} numbers <a href="https://www.zelix.com/klassmaster/featuresLongEncryption.html">https://www.zelix.com/klassmaster/featuresLongEncryption.html</a>
  *
@@ -53,7 +50,7 @@ public class ZelixLongEncryptionTransformer extends Transformer {
 
   @Override
   protected void transform(ClassWrapper scope, Context context) throws Exception {
-    List<String> classesToRemove = new ArrayList<>();
+    SandBox sandBox = new SandBox(context);
 
     context.classes(scope).forEach(classWrapper -> classWrapper.findClInit().ifPresent(clinit -> {
       MethodContext methodContext = MethodContext.create(classWrapper, clinit);
@@ -77,8 +74,6 @@ protected void transform(ClassWrapper scope, Context context) throws Exception {
           ClassWrapper longDecrypterCreatorClass = context.getClasses().get(createDecrypterInsn.owner);
 
           try {
-            SandBox sandBox = context.getSandBox();
-
             // Create decrypter
             InstanceClass clazz = sandBox.getHelper().loadClass(longDecrypterCreatorClass.canonicalName());
             ObjectValue longDecrypterInstance = sandBox.getInvocationUtil().invokeReference(
@@ -96,17 +91,6 @@ protected void transform(ClassWrapper scope, Context context) throws Exception {
                 Argument.int64(decryptKey)
             );
 
-            // Add classes to remove
-            if (!classesToRemove.contains(longDecrypterCreatorClass.name())) {
-              classesToRemove.add(longDecrypterCreatorClass.name());
-            }
-            if (!classesToRemove.contains(longDecrypterClass.getInternalName())) {
-              classesToRemove.add(longDecrypterClass.getInternalName());
-            }
-            if (!classesToRemove.contains(longDecrypterCreatorClass.getClassNode().interfaces.get(0))) {
-              classesToRemove.add(longDecrypterCreatorClass.getClassNode().interfaces.get(0));
-            }
-
             // Remove all instructions that creates decrypter
             decryptContext.removeAll();
 
@@ -120,6 +104,6 @@ protected void transform(ClassWrapper scope, Context context) throws Exception {
       }
     }));
 
-    classesToRemove.forEach(className -> context.getClasses().remove(className));
+    sandBox.getUsedCustomClasses().forEach(clazz -> context.getClasses().remove(clazz.getInternalName()));
   }
 }