diff --git a/src/scrabble.js b/src/scrabble.js
index 0d18249..da589d2 100644
--- a/src/scrabble.js
+++ b/src/scrabble.js
@@ -1,5 +1,145 @@
-function scrabble() {
-  // write code here
+const lettersValues = {
+  a: 1,
+  b: 3,
+  c: 3,
+  d: 2,
+  e: 1,
+  f: 4,
+  g: 2,
+  h: 4,
+  i: 1,
+  j: 8,
+  k: 5,
+  l: 1,
+  m: 3,
+  n: 1,
+  o: 1,
+  p: 3,
+  q: 10,
+  r: 1,
+  s: 1,
+  t: 1,
+  u: 1,
+  v: 4,
+  w: 4,
+  x: 8,
+  y: 4,
+  z: 10
+}
+
+const scrabble = (word) => {
+  if (validateWord(word)) {
+    const lowerCaseWord = word.toLowerCase()
+    const wordScoreTally = tallyLetterScores(lowerCaseWord)
+    const wordScoreDouble = doubleWordRule(lowerCaseWord)
+    const wordScoreTriple = tripleWordRule(lowerCaseWord)
+    return tallyFinalScores(wordScoreTally, wordScoreDouble, wordScoreTriple)
+  } else {
+    return 0
+  }
+}
+
+const validateWord = (word) => {
+  let openingBrace = 0
+  let closingBrace = 0
+  let openingBracket = 0
+  let closingBracket = 0
+
+  if (!word) {
+    return false
+  }
+
+  const lowerCaseWord = word.toLowerCase()
+  console.log(lowerCaseWord)
+  for (let i = 0; i < lowerCaseWord.length; i++) {
+    if (
+      Object.keys(lettersValues).includes(lowerCaseWord[i]) ||
+      lowerCaseWord[i] === '{' ||
+      lowerCaseWord[i] === '}' ||
+      lowerCaseWord[i] === '[' ||
+      lowerCaseWord[i] === ']'
+    ) {
+      switch (lowerCaseWord[i]) {
+        case '{':
+          openingBrace++
+          break
+        case '}':
+          closingBrace++
+          break
+        case '[':
+          openingBracket++
+          break
+        case ']':
+          closingBracket++
+          break
+      }
+    } else {
+      return false
+    }
+  }
+
+  if (openingBrace !== closingBrace || openingBracket !== closingBracket) {
+    return false
+  } else {
+    return true
+  }
+}
+console.log(validateWord('OXYPHENBUTAZON'))
+
+const tallyLetterScores = (word) => {
+  let wordScoreSingle = 0
+  let wordScoreDouble = 0
+  let wordScoreTriple = 0
+
+  const multiplyByTwo = 2
+  const multiplyByThree = 3
+  for (let i = 0; i < word.length; i++) {
+    if (
+      word[i] === '{' ||
+      word[i] === '}' ||
+      word[i] === '[' ||
+      word[i] === ']'
+    ) {
+      continue
+    }
+    if (word[i - 1] === '{' && word[i + 1] === '}') {
+      wordScoreDouble += lettersValues[word[i]] * multiplyByTwo
+    } else if (word[i - 1] === '[' && word[i + 1] === ']') {
+      wordScoreTriple += lettersValues[word[i]] * multiplyByThree
+    } else {
+      wordScoreSingle += lettersValues[word[i]]
+    }
+  }
+  return wordScoreSingle + wordScoreDouble + wordScoreTriple
+}
+
+const doubleWordRule = (word) => {
+  for (let i = 0; i < word.length; i++) {
+    if (word[i] === '{' && word[i + 2] !== '}') {
+      return true
+    }
+  }
+  return false
+}
+
+const tripleWordRule = (word) => {
+  for (let i = 0; i < word.length; i++) {
+    if (word[i] === '[' && word[i + 2] !== ']') {
+      return true
+    }
+  }
+  return false
+}
+
+const tallyFinalScores = (lettersValue, scoreDouble, scoreTriple) => {
+  if (scoreDouble && scoreTriple) {
+    return (lettersValue *= 6)
+  } else if (scoreDouble) {
+    return (lettersValue *= 2)
+  } else if (scoreTriple) {
+    return (lettersValue *= 3)
+  }
+  return lettersValue
 }
 
 module.exports = scrabble