diff --git a/simulator/src/circuit.js b/simulator/src/circuit.js
index 9bd00c6bfe..c86f6d99be 100755
--- a/simulator/src/circuit.js
+++ b/simulator/src/circuit.js
@@ -35,6 +35,9 @@ import { changeClockEnable } from './sequential';
 import { changeInputSize } from './modules';
 import { verilogModeGet, verilogModeSet } from './Verilog2CV';
 import { updateTestbenchUI } from './testbench';
+import load, { removeBugNodes } from './data/load';
+import redo from './data/redo';
+import undo from './data/undo';
 
 export const circuitProperty = {
     toggleLayoutMode, setProjectName, changeCircuitName, changeClockTime, deleteCurrentCircuit, changeClockEnable, changeInputSize, changeLightMode,
@@ -374,4 +377,26 @@ export default class Scope {
         this.ox = (-minX) * this.scale + (width - (maxX - minX) * this.scale) / 2;
         this.oy = (-minY) * this.scale + (height - ytoolbarOffset - (maxY - minY) * this.scale) / 2;
     }
+
+    loadCircuit(data) {
+        if(data) {
+            load(data);
+        }
+        else{
+            alert("Invalid data");
+        }
+    }
+
+    removeBug() {
+        removeBugNodes(globalScope);
+    }
+
+    next() {
+      redo(globalScope);
+    }
+
+    previous() {
+      undo(globalScope);
+    }
+
 }
diff --git a/simulator/src/data/load.js b/simulator/src/data/load.js
index 17719881d6..1487b99b57 100755
--- a/simulator/src/data/load.js
+++ b/simulator/src/data/load.js
@@ -75,10 +75,10 @@ function loadModule(data, scope) {
  * for some issues while loading nodes.
  * @category data
  */
-function removeBugNodes(scope = globalScope) {
+export function removeBugNodes(scope = globalScope) {
     let x = scope.allNodes.length;
     for (let i = 0; i < x; i++) {
-        if (scope.allNodes[i].type !== 2 && scope.allNodes[i].parent.objectType === 'CircuitElement') { scope.allNodes[i].delete(); }
+        if (scope.allNodes[i].type === 2 && scope.allNodes[i].parent.objectType === 'CircuitElement') { scope.allNodes[i].delete(); }
         if (scope.allNodes.length !== x) {
             i = 0;
             x = scope.allNodes.length;
diff --git a/simulator/src/data/save.js b/simulator/src/data/save.js
index ea7fe50855..9b926198e0 100755
--- a/simulator/src/data/save.js
+++ b/simulator/src/data/save.js
@@ -85,7 +85,7 @@ export function generateSaveData(name, setName = true) {
     data.projectId = projectId;
     data.focussedCircuit = globalScope.id;
     data.orderedTabs = getTabsOrder();
-
+ 
     // Project Circuits, each scope is one circuit
     data.scopes = [];
     const dependencyList = {};