diff --git a/mods/replace.js b/mods/replace.js
new file mode 100644
index 00000000..cd5f3905
--- /dev/null
+++ b/mods/replace.js
@@ -0,0 +1,75 @@
+replaceFrom = "rock";
+replaceTo = "sand";
+
+document.addEventListener("keydown", function(e) { //replace prompt listener
+	// r = replaceElementPrompt()
+	if (e.keyCode == 222) {
+		e.preventDefault();
+		replaceElementPrompt();
+	}
+});
+
+function replaceElementPrompt() {
+	var fromElement = prompt("Enter the element you want to change");
+	// replace spaces with underscores
+	fromElement = fromElement.replace(/ /g, "_");
+	fromElementS = mostSimilarElement(fromElement);
+	if (fromElementS === null || fromElementS === undefined || fromElementS === "") {
+		alert("Element \"" + fromElement + "\" not found! Defaulting to rock.");
+		fromElementS = "rock";
+	};
+
+	var toElement = prompt("Enter what you want to replace \"" + fromElementS + "\" with");
+	// replace spaces with underscores
+	toElement = toElement.replace(/ /g, "_");
+	toElementS = mostSimilarElement(toElement);
+	if (toElementS === null || toElementS === undefined || toElementS === "") {
+		alert("Element \"" + toElement + "\" not found! Defaulting to sand.");
+		toElementS = "sand";
+	};
+	replaceFrom = fromElementS;
+	replaceTo = toElementS;
+	updateReplaceDescriptions();	
+}
+
+function updateReplaceDescriptions() {
+	elements.replace.desc = "Changes pixels of a specified type to another specified type.<br/>Currently replacing \"" + replaceFrom + "\" with \"" + replaceTo + "\".<br/>Press [\"] to open the replace prompt.";
+	elements.alt_replace.desc = "Changes pixels of a specified type to another specified type, but keeping their non-element-based properties.<br/>Currently replacing \"" + replaceFrom + "\" with \"" + replaceTo + "\".<br/>Press [\"] to open the replace prompt.";
+	elements.alt_alt_replace.desc = "Changes pixels of a specified type to another specified type, but keeping their non-element-based properties except for color.<br/>Currently replacing \"" + replaceFrom + "\" with \"" + replaceTo + "\".<br/>Press [\"] to open the replace prompt.";
+};
+
+elements.replace = {
+    color: ["#ff0000", "#ff0000", "#ff0000", "#7f00ff", "#0000ff", "#0000ff", "#0000ff"],
+    tool: function(pixel) {
+        if(pixel.element === replaceFrom) {
+			changePixel(pixel,replaceTo,true);
+		};
+    },
+    category: "tools",
+	desc: "Changes pixels of a specified type to another specified type.<br/>Currently replacing \"" + replaceFrom + "\" with \"" + replaceTo + "\".<br/>Press [KEY] to open the replace prompt.",
+};
+
+elements.alt_replace = {
+    color: ["#ffff00", "#ffff00", "#ffff00", "#cf7f4f", "#ff00ff", "#ff00ff", "#ff00ff"],
+    tool: function(pixel) {
+        if(pixel.element === replaceFrom) {
+			pixel.element = replaceTo;
+		};
+    },
+    category: "tools",
+	desc: "Changes pixels of a specified type to another specified type, but keeping their non-element-based properties.<br/>Currently replacing \"" + replaceFrom + "\" with \"" + replaceTo + "\".<br/>Press [KEY] to open the replace prompt.",
+	hidden: true,
+};
+
+elements.alt_alt_replace = {
+    color: ["#00ff00", "#00ff00", "#00ff00", "#cfcf00", "#ff0000", "#ff0000", "#ff0000"],
+    tool: function(pixel) {
+        if(pixel.element === replaceFrom) {
+			pixel.element = replaceTo;
+			pixel.color = pixelColorPick(pixel);
+		};
+    },
+    category: "tools",
+	desc: "Changes pixels of a specified type to another specified type, but keeping their non-element-based properties except for color.<br/>Currently replacing \"" + replaceFrom + "\" with \"" + replaceTo + "\".<br/>Press [KEY] to open the replace prompt.",
+	hidden: true,
+};
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