diff --git a/index.html b/index.html
index 563a25ec8..6a689bc03 100644
--- a/index.html
+++ b/index.html
@@ -492,17 +492,31 @@
         <select id="dev-menu-faction-dropdown"></select>
         <a id="dev-add-faction" class="a-link-button"> Receive invite </a>
 
-        <a id="dev-open-all" class="a-link-button"> NUKE + ports all servers </a>
-        <a id="dev-min-security" class="a-link-button"> minimize all servers security </a>
-        <a id="dev-max-money" class="a-link-button"> maximize all servers money </a>
-
         <select id="dev-menu-connect-dropdown"></select>
         <a id="dev-connect" class="a-link-button"> Connect </a>
 
         <select id="dev-menu-add-program-dropdown"></select>
         <a id="dev-add-program" class="a-link-button"> Add Program </a>
 
-        <!-- modify stats (hacking, int, etc) -->
+        <a id="dev-open-all" class="a-link-button"> NUKE + ports all servers </a>
+        <a id="dev-min-security" class="a-link-button"> minimize all servers security </a>
+        <a id="dev-max-money" class="a-link-button"> maximize all servers money </a>
+
+        <input id="dev-hacking-exp" type="number">
+        <a id="dev-add-hacking" class="a-link-button"> add hacking exp </a>
+        <input id="dev-strength-exp" type="number">
+        <a id="dev-add-strength" class="a-link-button"> add strength exp </a>
+        <input id="dev-defense-exp" type="number">
+        <a id="dev-add-defense" class="a-link-button"> add defense exp </a>
+        <input id="dev-dexterity-exp" type="number">
+        <a id="dev-add-dexterity" class="a-link-button"> add dexterity exp </a>
+        <input id="dev-agility-exp" type="number">
+        <a id="dev-add-agility" class="a-link-button"> add agility exp </a>
+        <input id="dev-charisma-exp" type="number">
+        <a id="dev-add-charisma" class="a-link-button"> add charisma exp </a>
+        <input id="dev-intelligence-exp" type="number">
+        <a id="dev-add-intelligence" class="a-link-button"> add intelligence exp </a>
+        <a id="dev-unlock-intelligence" class="a-link-button"> unlock intelligence </a>
     </div>
 
     <!-- Location (visiting a location in World) -->
diff --git a/src/Player.js b/src/Player.js
index 4ce865dec..6e780dbf4 100644
--- a/src/Player.js
+++ b/src/Player.js
@@ -587,6 +587,9 @@ PlayerObject.prototype.gainHackingExp = function(exp) {
         console.log("ERR: NaN passed into Player.gainHackingExp()"); return;
     }
     this.hacking_exp += exp;
+    if(this.hacking_exp < 0) {
+        this.hacking_exp = 0;
+    }
 }
 
 PlayerObject.prototype.gainStrengthExp = function(exp) {
@@ -594,6 +597,9 @@ PlayerObject.prototype.gainStrengthExp = function(exp) {
         console.log("ERR: NaN passed into Player.gainStrengthExp()"); return;
     }
     this.strength_exp += exp;
+    if(this.strength_exp < 0) {
+        this.strength_exp = 0;
+    }
 }
 
 PlayerObject.prototype.gainDefenseExp = function(exp) {
@@ -601,6 +607,9 @@ PlayerObject.prototype.gainDefenseExp = function(exp) {
         console.log("ERR: NaN passed into player.gainDefenseExp()"); return;
     }
     this.defense_exp += exp;
+    if(this.defense_exp < 0) {
+        this.defense_exp = 0;
+    }
 }
 
 PlayerObject.prototype.gainDexterityExp = function(exp) {
@@ -608,6 +617,9 @@ PlayerObject.prototype.gainDexterityExp = function(exp) {
         console.log("ERR: NaN passed into Player.gainDexterityExp()"); return;
     }
     this.dexterity_exp += exp;
+    if(this.dexterity_exp < 0) {
+        this.dexterity_exp = 0;
+    }
 }
 
 PlayerObject.prototype.gainAgilityExp = function(exp) {
@@ -615,6 +627,9 @@ PlayerObject.prototype.gainAgilityExp = function(exp) {
         console.log("ERR: NaN passed into Player.gainAgilityExp()"); return;
     }
     this.agility_exp += exp;
+    if(this.agility_exp < 0) {
+        this.agility_exp = 0;
+    }
 }
 
 PlayerObject.prototype.gainCharismaExp = function(exp) {
@@ -622,6 +637,9 @@ PlayerObject.prototype.gainCharismaExp = function(exp) {
         console.log("ERR: NaN passed into Player.gainCharismaExp()"); return;
     }
     this.charisma_exp += exp;
+    if(this.charisma_exp < 0) {
+        this.charisma_exp = 0;
+    }
 }
 
 PlayerObject.prototype.gainIntelligenceExp = function(exp) {
diff --git a/src/engine.js b/src/engine.js
index fa18e7596..9c56825ca 100644
--- a/src/engine.js
+++ b/src/engine.js
@@ -175,6 +175,21 @@ let Engine = {
         devMenuConnect: null,
         devMenuProgramsDropdown: null,
         devMenuAddProgram: null,
+        devMenuHackingExp: null,
+        devMenuAddHacking: null,
+        devMenuStrengthExp: null,
+        devMenuAddStrength: null,
+        devMenuDefenseExp: null,
+        devMenuAddDefense: null,
+        devMenuDexterityExp: null,
+        devMenuAddDexterity: null,
+        devMenuAgilityExp: null,
+        devMenuAddAgility: null,
+        devMenuCharismaExp: null,
+        devMenuAddCharisma: null,
+        devMenuIntelligenceExp: null,
+        devMenuAddIntelligence: null,
+        devMenuUnlockIntelligence: null,
     },
 
     //Display objects
@@ -823,10 +838,26 @@ let Engine = {
         Engine.Clickables.devMenuOpen.style.display = "block";
         Engine.Clickables.devMenuMinSecurity.style.display = "block";
         Engine.Clickables.devMenuMaxMoney.style.display = "block";
-        Engine.Clickables.devMenuConnectDropdown = "block";
-        Engine.Clickables.devMenuConnect = "block";
-        Engine.Clickables.devMenuProgramsDropdown = "block";
-        Engine.Clickables.devMenuAddProgram = "block";
+        Engine.Clickables.devMenuConnectDropdown.style.display = "block";
+        Engine.Clickables.devMenuConnect.style.display = "block";
+        Engine.Clickables.devMenuProgramsDropdown.style.display = "block";
+        Engine.Clickables.devMenuAddProgram.style.display = "block";
+
+        Engine.Clickables.devMenuHackingExp.style.display = "block";
+        Engine.Clickables.devMenuAddHacking.style.display = "block";
+        Engine.Clickables.devMenuStrengthExp.style.display = "block";
+        Engine.Clickables.devMenuAddStrength.style.display = "block";
+        Engine.Clickables.devMenuDefenseExp.style.display = "block";
+        Engine.Clickables.devMenuAddDefense.style.display = "block";
+        Engine.Clickables.devMenuDexterityExp.style.display = "block";
+        Engine.Clickables.devMenuAddDexterity.style.display = "block";
+        Engine.Clickables.devMenuAgilityExp.style.display = "block";
+        Engine.Clickables.devMenuAddAgility.style.display = "block";
+        Engine.Clickables.devMenuCharismaExp.style.display = "block";
+        Engine.Clickables.devMenuAddCharisma.style.display = "block";
+        Engine.Clickables.devMenuIntelligenceExp.style.display = "block";
+        Engine.Clickables.devMenuAddIntelligence.style.display = "block";
+        Engine.Clickables.devMenuUnlockIntelligence.style.display = "block";
     },
 
     //Displays the text when a section of the Tutorial is opened
@@ -1588,6 +1619,67 @@ let Engine = {
             }
         });
 
+        Engine.Clickables.devMenuHackingExp = document.getElementById("dev-hacking-exp");
+        Engine.Clickables.devMenuAddHacking = document.getElementById("dev-add-hacking");
+        Engine.Clickables.devMenuAddHacking.addEventListener("click", function() {
+            const exp = parseInt(Engine.Clickables.devMenuHackingExp.value);
+            Player.gainHackingExp(exp);
+            Player.updateSkillLevels();
+        });
+
+        Engine.Clickables.devMenuStrengthExp = document.getElementById("dev-strength-exp");
+        Engine.Clickables.devMenuAddStrength = document.getElementById("dev-add-strength");
+        Engine.Clickables.devMenuAddStrength.addEventListener("click", function() {
+            const exp = parseInt(Engine.Clickables.devMenuStrengthExp.value);
+            Player.gainStrengthExp(exp);
+            Player.updateSkillLevels();
+        });
+
+        Engine.Clickables.devMenuDefenseExp = document.getElementById("dev-defense-exp");
+        Engine.Clickables.devMenuAddDefense = document.getElementById("dev-add-defense");
+        Engine.Clickables.devMenuAddDefense.addEventListener("click", function() {
+            const exp = parseInt(Engine.Clickables.devMenuDefenseExp.value);
+            Player.gainDefenseExp(exp);
+            Player.updateSkillLevels();
+        });
+
+        Engine.Clickables.devMenuDexterityExp = document.getElementById("dev-dexterity-exp");
+        Engine.Clickables.devMenuAddDexterity = document.getElementById("dev-add-dexterity");
+        Engine.Clickables.devMenuAddDexterity.addEventListener("click", function() {
+            const exp = parseInt(Engine.Clickables.devMenuDexterityExp.value);
+            Player.gainDexterityExp(exp);
+            Player.updateSkillLevels();
+        });
+
+        Engine.Clickables.devMenuAgilityExp = document.getElementById("dev-agility-exp");
+        Engine.Clickables.devMenuAddAgility = document.getElementById("dev-add-agility");
+        Engine.Clickables.devMenuAddAgility.addEventListener("click", function() {
+            const exp = parseInt(Engine.Clickables.devMenuAgilityExp.value);
+            Player.gainAgilityExp(exp);
+            Player.updateSkillLevels();
+        });
+
+        Engine.Clickables.devMenuCharismaExp = document.getElementById("dev-charisma-exp");
+        Engine.Clickables.devMenuAddCharisma = document.getElementById("dev-add-charisma");
+        Engine.Clickables.devMenuAddCharisma.addEventListener("click", function() {
+            const exp = parseInt(Engine.Clickables.devMenuCharismaExp.value);
+            Player.gainCharismaExp(exp);
+            Player.updateSkillLevels();
+        });
+
+        Engine.Clickables.devMenuIntelligenceExp = document.getElementById("dev-intelligence-exp");
+        Engine.Clickables.devMenuAddIntelligence = document.getElementById("dev-add-intelligence");
+        Engine.Clickables.devMenuAddIntelligence.addEventListener("click", function() {
+            const exp = parseInt(Engine.Clickables.devMenuIntelligenceExp.value);
+            Player.gainIntelligenceExp(exp);
+            Player.updateSkillLevels();
+        });
+
+        Engine.Clickables.devMenuUnlockIntelligence = document.getElementById("dev-unlock-intelligence");
+        Engine.Clickables.devMenuUnlockIntelligence.addEventListener("click", function() {
+            Player.intelligence = 1;
+        });
+
         //If DarkWeb already purchased, disable the button
         if (SpecialServerIps.hasOwnProperty("Darkweb Server")) {
             document.getElementById("location-purchase-tor").setAttribute("class", "a-link-button-inactive");