diff --git a/script.js b/script.js
index bbe8a29..fefb161 100644
--- a/script.js
+++ b/script.js
@@ -1,4 +1,59 @@
-var main = function (input) {
-  var myOutputValue = 'hello world';
-  return myOutputValue;
+// this is a basic version of scissors paper stone //
+// scissors beats paper //
+// paper beats stone //
+// stone beats scissors //
+// if both parties choose the same object, it is a draw //
+// user chooses input as scissors paper or stone //
+// randomly return one of scissors paper or stone //
+
+var generateMove = function () {
+  // Generate random number between 1 and 3 //
+  var numPossibleMoves = 3;
+  var randomNum = Math.floor(Math.random() * numPossibleMoves) + 1;
+
+  // Return the word that corresponds to the relevant number //
+  if (randomNum == 1) {
+    return "scissors";
+  }
+  if (randomNum == 2) {
+    return "paper";
+  }
+  return "stone";
+};
+
+var main = function (userMove) {
+  var move = generateMove();
+  var standardMessage = `You played: ${userMove}. Computer played: ${move}.`;
+  // if both parties choose the same object, it is a draw //
+  if (move == userMove) {
+    return `${standardMessage} <br> <br> It's a draw! Please play again.`;
+  }
+  // scissors beats paper //
+  if (move == "scissors" && userMove == "paper") {
+    return `${standardMessage} <br> <br> You lost! Please play again.`;
+  }
+  // paper beats stone //
+  if (move == "paper" && userMove == "stone") {
+    return `${standardMessage} <br> <br> You lost! Please play again.`;
+  }
+  // stone beats scissors //
+  if (move == "stone" && userMove == "scissors") {
+    return `${standardMessage} <br> <br> You lost! Please play again.`;
+  }
+  // scissors beats paper //
+  if (userMove == "scissors" && move == "paper") {
+    return `${standardMessage} <br> <br> You won! Please play again.`;
+  }
+  // paper beats stone //
+  if (userMove == "paper" && move == "stone") {
+    return `${standardMessage} <br> <br> You won! Please play again.`;
+  }
+  // stone beats scissors //
+  if (userMove == "stone" && move == "scissors") {
+    return `${standardMessage} <br> <br> You won! Please play again.`;
+  }
+  // if user puts in undefined move //
+  if (userMove != "scissors" || "paper" || "stone") {
+    return `Your move is not valid! <br> <br> To play, please enter scissors, paper, or stone`;
+  }
 };