diff --git a/Kotlin/6.Sum_square_difference/bartonstaley.kt b/Kotlin/6.Sum_square_difference/bartonstaley.kt
new file mode 100644
index 0000000..0098460
--- /dev/null
+++ b/Kotlin/6.Sum_square_difference/bartonstaley.kt
@@ -0,0 +1,31 @@
+/*
+    Project Euler Question 6. Sum square difference
+    
+	Problem Statement: 
+    
+    The sum of the squares of the first ten natural numbers is,
+
+        1^2 + 2^2 + ... + 10^2 = 385
+    
+    The square of the sum of the first ten natural numbers is,
+
+        (1 + 2 + ... + 10)^2 = 552 = 3025
+    
+    Hence the difference between the sum of the squares of the first ten
+    natural numbers and the square of the sum is 3025 − 385 = 2640.
+
+    Find the difference between the sum of the squares of the first one hundred
+    natural numbers and the square of the sum.
+ */
+
+fun Int.square() = this * this
+
+fun sum(n: Int) = (n * (n + 1)) / 2
+
+fun sumOfSquares(n: Int) = n * (n + 1) * (2 * n + 1) / 6
+
+fun sumSquareDifference(n: Int) = sum(n).square() - sumOfSquares(n)
+
+fun main(args: Array<String>) {
+    println("Sum square difference of 100: " + sumSquareDifference(100))
+}
diff --git a/README.md b/README.md
index 664b614..fa49e9e 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ Happy Contributing! 😃
 | 03 | [Largest prime factor](https://projecteuler.net/problem=3)                   | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: |    | :white_check_mark: |                    |                    |       |
 | 04 | [Largest palindrome product](https://projecteuler.net/problem=4)             | :white_check_mark: |                    |                    | :white_check_mark: |                    |                    | :white_check_mark: |    |                    |                    |                    |       |
 | 05 | [Smallest multiple](https://projecteuler.net/problem=5)                      | :white_check_mark: |                    |                    | :white_check_mark: |                    |                    |                    |    | :white_check_mark: |                    |                    |       |
-| 06 | [Sum square difference](https://projecteuler.net/problem=6)                  | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: |    |                    |                    |                    |       |
+| 06 | [Sum square difference](https://projecteuler.net/problem=6)                  | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |    |                    |                    |                    |       |
 | 07 | [10001st prime](https://projecteuler.net/problem=7)                          | :white_check_mark: |                    |                    | :white_check_mark: |                    | :white_check_mark: | :white_check_mark: |    |                    |                    |                    |       |
 | 08 | [Largest product in a series](https://projecteuler.net/problem=8)            |                    |                    |                    | :white_check_mark: |                    |                    |                    |    |                    |                    |                    |       |
 | 09 | [Special Pythagorean triplet](https://projecteuler.net/problem=9)            | :white_check_mark: |                    |                    | :white_check_mark: |                    |                    |                    |    |                    |                    |                    |       |