diff --git a/closures.js b/closures.js
index 2329c00..5b1a993 100644
--- a/closures.js
+++ b/closures.js
@@ -128,3 +128,270 @@ function rollCall(names) {
 // rollCaller() // -> Should log 'Ruth'
 // rollCaller() // -> Should log 'Everyone accounted for'
 
+// CHALLENGE 9
+function cycleIterator(array) {
+  let count = -1;
+  const innerFunc = () => {
+    if (count < array.length) {
+      count++;
+    }
+    if (count >= array.length) {
+      count = 0;
+    }
+    return array[count];
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// const threeDayWeekend = ['Fri', 'Sat', 'Sun'];
+// const getDay = cycleIterator(threeDayWeekend);
+// console.log(getDay()); // => should log 'Fri'
+// console.log(getDay()); // => should log 'Sat'
+// console.log(getDay()); // => should log 'Sun'
+// console.log(getDay()); // => should log 'Fri'
+
+// CHALLENGE 10
+function defineFirstArg(func, arg) {
+  const innerFunc = (val) => {
+    return func(arg, val);
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// const subtract = function(big, small) { return big - small; };
+// const subFrom20 = defineFirstArg(subtract, 20);
+// console.log(subFrom20(5)); // => should log 15
+
+// CHALLENGE 11
+function dateStamp(func) {
+  const innerFunc = (val) => {
+    const d = new Date();
+    let o = {
+      date: d.toLocaleString(),
+      output: func(val),
+    };
+    return o;
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// const stampedMultBy2 = dateStamp(n => n * 2);
+// console.log(stampedMultBy2(4)); // => should log { date: (today's date), output: 8 }
+// console.log(stampedMultBy2(6)); // => should log { date: (today's date), output: 12 }
+
+// CHALLENGE 12
+function myReplace(str, ...pair) {
+  return str.replace(new RegExp(pair[0]), pair[1]);
+}
+
+function censor() {
+  let list = [];
+  const innerFunc = (a, b = "") => {
+    if (b !== "") {
+      list.push([a, b]);
+    } else {
+      return list.map((x) => myReplace(a, ...x));
+    }
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// const changeScene = censor();
+// changeScene('dogs', 'cats');
+// changeScene('quick', 'slow');
+// console.log(changeScene('The quick, brown fox jumps over the lazy dogs.')); // => should log 'The slow, brown fox jumps over the lazy cats.'
+
+// CHALLENGE 13
+function createSecretHolder(secret) {
+  const o = {
+    getSecret() {
+      return secret;
+    },
+    setSecret(val) {
+      secret = val;
+    },
+  };
+  return o;
+}
+
+// /*** Uncomment these to check your work! ***/
+// let obj = createSecretHolder(5)
+// console.log(obj.getSecret()) // => returns 5
+// obj.setSecret(2)
+// console.log(obj.getSecret()) // => returns 2
+
+// CHALLENGE 14
+function callTimes() {
+  let count = 0;
+  const innerFunc = () => {
+    count++;
+    return count;
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// let myNewFunc1 = callTimes();
+// let myNewFunc2 = callTimes();
+// console.log(myNewFunc1()); // => 1
+// console.log(myNewFunc1()); // => 2
+// console.log(myNewFunc2()); // => 1
+// console.log(myNewFunc2()); // => 2
+
+// CHALLENGE 15
+function russianRoulette(num) {
+  const innerFunc = () => {
+    let str = "";
+    switch (num) {
+      case 0:
+        return "reload to play again";
+      case 1:
+        num--;
+        return "bang";
+      default:
+        num--;
+        return "click";
+    }
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// const play = russianRoulette(3);
+// console.log(play()); // => should log 'click'
+// console.log(play()); // => should log 'click'
+// console.log(play()); // => should log 'bang'
+// console.log(play()); // => should log 'reload to play again'
+// console.log(play()); // => should log 'reload to play again'
+
+// CHALLENGE 16
+function average() {
+  let list = [];
+  const innerFunc = (...args) => {
+    if (args.length !== 0) list.push(args[0]);
+    if (list.length > 0) return list.reduce((a, b) => a + b, 0) / list.length;
+    return 0;
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// const avgSoFar = average();
+// console.log(avgSoFar()); // => should log 0
+// console.log(avgSoFar(4)); // => should log 4
+// console.log(avgSoFar(8)); // => should log 6
+// console.log(avgSoFar()); // => should log 6
+// console.log(avgSoFar(12)); // => should log 8
+// console.log(avgSoFar()); // => should log 8
+
+// CHALLENGE 17
+function makeFuncTester(arrOfTests) {
+  const innerFunc = (func) => {
+    let res = arrOfTests
+      .map((x) => [func(x[0]), x[1]])
+      .filter((x) => x[0] === x[1]);
+    return arrOfTests.length === res.length;
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// const capLastTestCases = [];
+// capLastTestCases.push(['hello', 'hellO']);
+// capLastTestCases.push(['goodbye', 'goodbyE']);
+// capLastTestCases.push(['howdy', 'howdY']);
+// const shouldCapitalizeLast = makeFuncTester(capLastTestCases);
+// const capLastAttempt1 = str => str.toUpperCase();
+// const capLastAttempt2 = str => str.slice(0, -1) + str.slice(-1).toUpperCase();
+// console.log(shouldCapitalizeLast(capLastAttempt1)); // => should log false
+// console.log(shouldCapitalizeLast(capLastAttempt2)); // => should log true
+
+// CHALLENGE 18
+function makeHistory(limit) {
+  let history = [];
+  const innerFunc = (str) => {
+    if (str === "undo") {
+      if (history.length) {
+        let element = history.pop();
+        return element + " undone";
+      }
+      return "nothing to undo";
+    }
+    if (history.length >= limit) history.shift();
+    history.push(str);
+    return str + " done";
+  };
+  return innerFunc;
+}
+
+// /*** Uncomment these to check your work! ***/
+// const myActions = makeHistory(2);
+// console.log(myActions('jump')); // => should log 'jump done'
+// console.log(myActions('undo')); // => should log 'jump undone'
+// console.log(myActions('walk')); // => should log 'walk done'
+// console.log(myActions('code')); // => should log 'code done'
+// console.log(myActions('pose')); // => should log 'pose done'
+// console.log(myActions('undo')); // => should log 'pose undone'
+// console.log(myActions('undo')); // => should log 'code undone'
+// console.log(myActions('undo')); // => should log 'nothing to undo'
+
+// CHALLENGE 19
+function blackjack(array) {
+  let count = -1;
+  const dealer = (card1, card2) => {
+    let sum = 0;
+    let busted = false;
+    const another = () => {
+      if (sum === 0) sum = card1 + card2;
+      else sum = sum + array[count];
+      if (sum <= 21) {
+        count++;
+        return sum;
+      } else {
+        if (busted) return "you are done";
+        busted = true;
+        return "bust";
+      }
+    };
+    return another;
+  };
+  return dealer;
+}
+
+// /*** Uncomment these to check your work! ***/
+
+// /*** DEALER ***/
+const deal = blackjack([2, 6, 1, 7, 11, 4, 6, 3, 9, 8, 9, 3, 10, 4, 5, 3, 7, 4, 9, 6, 10, 11]);
+
+// /*** PLAYER 1 ***/
+// const i_like_to_live_dangerously = deal(4, 5);
+// console.log(i_like_to_live_dangerously()); // => should log 9
+// console.log(i_like_to_live_dangerously()); // => should log 11
+// console.log(i_like_to_live_dangerously()); // => should log 17
+// console.log(i_like_to_live_dangerously()); // => should log 18
+// console.log(i_like_to_live_dangerously()); // => should log 'bust'
+// console.log(i_like_to_live_dangerously()); // => should log 'you are done!'
+// console.log(i_like_to_live_dangerously()); // => should log 'you are done!'
+
+// /*** BELOW LINES ARE FOR THE BONUS ***/
+
+// /*** PLAYER 2 ***/
+// const i_TOO_like_to_live_dangerously = deal(2, 2);
+// console.log(i_TOO_like_to_live_dangerously()); // => should log 4
+// console.log(i_TOO_like_to_live_dangerously()); // => should log 15
+// console.log(i_TOO_like_to_live_dangerously()); // => should log 19
+// console.log(i_TOO_like_to_live_dangerously()); // => should log 'bust'
+// console.log(i_TOO_like_to_live_dangerously()); // => should log 'you are done!
+// console.log(i_TOO_like_to_live_dangerously()); // => should log 'you are done!
+
+// /*** PLAYER 3 ***/
+// const i_ALSO_like_to_live_dangerously = deal(3, 7);
+// console.log(i_ALSO_like_to_live_dangerously()); // => should log 10
+// console.log(i_ALSO_like_to_live_dangerously()); // => should log 13
+// console.log(i_ALSO_like_to_live_dangerously()); // => should log 'bust'
+// console.log(i_ALSO_like_to_live_dangerously()); // => should log 'you are done!
+// console.log(i_ALSO_like_to_live_dangerously()); // => should log 'you are done!