diff --git a/script.js b/script.js
index bbe8a293..babdb018 100644
--- a/script.js
+++ b/script.js
@@ -1,4 +1,125 @@
-var main = function (input) {
-  var myOutputValue = 'hello world';
-  return myOutputValue;
+var GAME_STATE_DICE_ROLL = 'GAME_STATE_DICE_ROLL';
+var GAME_STATE_CHOOSE_DICE_ORDER = 'GAME_STATE_CHOOSE_DICE_ORDER';
+var GAME_STATE_COMPARE_SCORES = 'GAME_STATE_COMPARE_SCORES';
+var gameState = GAME_STATE_DICE_ROLL;
+
+var currentPlayerRolls = []; 
+
+var currentPlayer = 1;
+var allPlayersScore = []; 
+
+var rollDice = function(){
+  console.log('Control flow: start of rollDice()')
+  var randomInteger = Math.ceil(Math.random() * 6);
+  
+  console.log('rollDice output, randomInteger:', randomInteger);
+  return randomInteger;
+};
+
+var rollDiceForPlayer = function(){
+  console.log('Control flow: start of rollDiceForPlayer()');
+  var counter = 0;
+  while (counter < 2){
+    currentPlayerRolls.push(rollDice());
+    counter = counter + 1;
+  }
+
+  console.log('rollDiceForPLayer changes, currentPlayerRolls:', currentPlayerRolls);
+  return "Welcome, Player "+ currentPlayer + "<br><br>You rolled:<br>Dice 1:" + currentPlayerRolls[0] + "| Dice 2:" + currentPlayerRolls[1] + ".<br><br>Now, please input either '1' or '2' to choose the corresponding dice to be used as the first digit of your final value."
+};
+
+var getPlayerScore = function(playerInput){
+
+  var playerScore;
+
+  if(playerInput != 1 && playerInput != 2){
+      console.log('Control flow: input validation, valid input... Not 1 & not 2');
+      return"Error! Please only input '1' or '2' to choose which dice to use as the first digit.<br><br>Your dice rolls are:<br>Dice 1: " + currentPlayerRolls[0] + "| Dice 2: " + currentPlayerRolls[1] + "."; 
+    }
+
+    if(playerInput == 1){
+      var playerScore = Number(String(currentPlayerRolls[0]) + String(currentPlayerRolls[1]));
+      return "Your chosen value is:" + playerScore;
+    }
+
+    if(playerInput == 2){
+      var playerScore = Number(String(currentPlayerRolls[1]) + String(currentPlayerRolls[0]));
+
+      allPlayersScore.push(playerScore);
+
+      curren = [];
+      return "Player "+ currentPlayer + ", your chosen value is: " + playerScore;
+    }
 };
+
+//Need to check this function
+var comparePlayersScores = function(){
+
+    var compareMessage = "Player 1 score:" + allPlayersScore[0] + "<br>Player 2 score: " + allPlayersScore[1];
+
+    if(allPlayersScore[0] > allPlayersScore[1]){
+      compareMessage = compareMessage + "<br><br>Player 1 wins.";
+    }
+
+    if(allPlayersScore[0] < allPlayersScore[1]){
+      compareMessage = compareMessage + "<br><br>Player 2 wins.";
+    }
+
+    if(allPlayersScore[0] == allPlayersScore[1]){
+      compareMessage = compareMessage + "<br><br>It is a tie.";
+    }
+    
+    return compareMessage;
+};
+
+var resetGame = function(){ 
+  currentPlayer = 1;
+  gameState = GAME_STATE_DICE_ROLL;
+  allPlayersScore = [];
+};
+
+var main = function (input) {
+  console.log('Checking game state on submit click:', gameState);
+  console.log('Checking currentPlayer on submit click:', currentPlayer);
+  var outputMessage = '';
+
+  if(gameState == GAME_STATE_DICE_ROLL){
+    console.log ('Control flow: gameState == GAME_STATE_DICE_ROLL');
+  
+    outputMessage = rollDiceForPlayer();
+
+    gameState = GAME_STATE_CHOOSE_DICE_ORDER;
+    return outputMessage;
+  }
+
+  if(gameState == GAME_STATE_CHOOSE_DICE_ORDER){
+    console.log('Control flow: gameState == GAME_STATE_CHOOSE_DICE_ROLL');
+
+    outputMessage = getPlayerScore(input);
+
+    if(currentPlayer == 1){
+      console.log("Control flow: end of player 1's turn, now player 2's turn");
+      currentPlayer = 2;
+      gameState = GAME_STATE_DICE_ROLL;
+      return outputMessage + "<br><br>It is now player 2's turn!";
+    }
+
+    if(currentPlayer == 2){
+      console.log("Control flow: end of player 2's turn, Next submit click will calculate score.");
+      gameState = GAME_STATE_COMPARE_SCORES;
+      return outputMessage + "<br><br>Press submit to calculate scores.";
+    }
+  }
+
+  if(gameState == GAME_STATE_COMPARE_SCORES){
+    console.log('Control flow: gameState == GAME_STATE_COMPARE_SCORES');
+
+    outputMessage = comparePlayersScores();
+
+    resetGame();
+    console.log("Current player after reset: ", currentPlayer);
+    console.log("Game state after reset:", gameState);
+    console.log("allPlayersScore array: ", allPlayersScore);
+    return outputMessage;
+  }
+}
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