diff --git a/README.md b/README.md
index 64ee42d..572dddf 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,7 @@
 # CMSC 388Q
-Course material for CMSC 388Q
+Course material for CMSC 388Q\
+Coded by: Priya Mapara, Myckell Ronquillo, and Maya Narayanasamy
+
+Guessing game code: specified number, random number generator, with a GUI
+
+Find leap year code
diff --git a/guessing-gui.rkt b/guessing-gui.rkt
new file mode 100644
index 0000000..b0fc1c3
--- /dev/null
+++ b/guessing-gui.rkt
@@ -0,0 +1,65 @@
+; This program is a simple guessing game with a gui
+; Coded by Myckell Ronquillo
+
+#lang racket
+(require 2htdp/universe 2htdp/image)
+
+; Guessing range 
+(struct range (min max))
+
+; Help text
+(define TOP-TEXT
+  (text "Up Arrow if # > current, Down Arrow if # < current"
+        20
+        "black"))
+(define BOTTOM-TEXT
+  (text "Press SPACE if curr # is correct"
+        20
+        "black"))
+
+; Screen display settings
+(define SCREEN-DISP
+  (place-image/align
+   TOP-TEXT 3 10 "left" "top"
+   (place-image/align
+    BOTTOM-TEXT 3 130 "left" "bottom"
+    (empty-scene 475 150))))
+
+; Key-Events
+(define (deal-with-guess n key)
+  (cond [(key=? key "up") (bigger n)]
+        [(key=? key "down") (smaller n)]
+        [(key=? key " ") (stop-with n)]     
+        [else n]))
+
+; If number is less than current
+(define (smaller n)
+  (range (range-min n)
+            (max (range-min n) (sub1 (guess n)))))
+
+; If number is greater than current
+(define (bigger n)
+  (range (min (range-max n) (add1 (guess n)))
+            (range-max n)))
+
+; Does the binary search
+(define (guess n)
+  (quotient (+ (range-min n) (range-max n)) 2))
+
+; Rendering
+(define (render n)
+  (overlay (text (number->string (guess n)) 32 "red") SCREEN-DISP))
+
+(define (render-last-scene n)
+  (overlay (text (string-append "Your number is: " (number->string (guess n))) 32 "green") SCREEN-DISP))
+
+; If number is found
+(define (single? n)
+  (= (range-min n) (range-max n)))
+
+; Main
+(define (start lower upper)
+  (big-bang (range lower upper)
+           (on-key deal-with-guess)
+           (to-draw render)
+           (stop-when single? render-last-scene)))
\ No newline at end of file
diff --git a/intro-racket.rkt b/intro-racket.rkt
new file mode 100644
index 0000000..0d6f4bf
--- /dev/null
+++ b/intro-racket.rkt
@@ -0,0 +1,29 @@
+#lang slideshow
+;; the racket tutorial // playing around with racket
+(define c (circle 10))
+(define r (rectangle 10 20))
+
+(define (four p)
+  (define two-p (hc-append p p))
+  (vc-append two-p two-p))
+
+(define (checker p1 p2)
+  (let ([p12 (hc-append p1 p2)]
+        [p21 (hc-append p2 p1)])
+    (vc-append p12 p21)))
+(define (square n)
+  ; A semi-colon starts a line comment.
+  ; The expression below is the function body.
+  (filled-rectangle n n))
+
+(define (checkerboard p)
+  (let* ([rp (colorize p "red")]
+         [bp (colorize p "black")]
+         [c (checker rp bp)]
+         [c4 (four c)])
+    (four c4)))
+
+(define x 10) ;; x = 10
+
+
+
diff --git a/is-leap-year.rkt b/is-leap-year.rkt
new file mode 100644
index 0000000..9e26d60
--- /dev/null
+++ b/is-leap-year.rkt
@@ -0,0 +1,19 @@
+#lang racket
+
+;; Coded by: Myckell Ronquillo, Maya Narayanasamy, and Priya Mapara
+
+(displayln "Is leap year? ")
+(newline)
+(displayln "A simple program that checks if the year entered is a leap year.")
+(displayln "To use this function, simply type in 'is-leap-year' and add the year")
+(displayln "you would like to check to see whether it is a leap year or not.")
+(newline)
+
+(define (is-leap-year year)
+  (if (equal? 0 (modulo year 400)) "This is a leap year" "This is not a leap year")
+  (if (equal? 0 (modulo year 100)) "This is not a leap year" "This is not a leap year")
+  (if (equal? 0 (modulo year 4)) "This is a leap year" "This is not a leap year"))
+
+
+
+
diff --git a/number guessing game with random generator.rkt b/number guessing game with random generator.rkt
new file mode 100644
index 0000000..f73f49f
--- /dev/null
+++ b/number guessing game with random generator.rkt	
@@ -0,0 +1,39 @@
+#lang racket
+
+;; coded by: Maya Narayanasamy & Priya Mapara
+;; used https://medium.com/@gjorgigjorgiev/guess-my-number-game-in-racket-3b47fe15a652 as a reference.
+;; includes a random number generator
+
+(displayln "Number Guessing Game ")
+(newline)
+(displayln "A simple program that will allow a user to enter a number.")
+(displayln "The user wil try to guess the number that is predetermined.")
+(displayln "If the number entered by the user is higher than the correct number,")
+(displayln "the phrase 'Too high. Try Again.' will be printed. If the number is lower ")
+(displayln "'Too Low. Try Again. will be printed.")
+(displayln "the number.")
+(newline)
+
+;; holds the content of the messages that will be displayed.
+(struct m (start-game guess-high guess-low win lose)) 
+(define messages(m "Enter a number from 1-100: "  "\nThe number you guessed is too high. Try Again. ""\nThe number you guessed is too low. Try Again. "
+                   "\n You gussed correctly!\n" "\nYou reached the maximum limit of guesses\n"))
+
+
+;; max number of tries
+(define (max-tries . args) 5)
+;; the number to be guessed
+(define (number . args) (random 100))
+;; scanning user input
+(define (user-guess . args)(read))
+;; displaying the messages and check cases
+(define (display-msg msg)(display msg))(define (make-game number guesses)(define (curr-game curr-guesses)
+    (let ((curr-guess (user-guess)))
+        (cond
+         [(> number curr-guess )(display-msg (m-guess-low messages))(curr-game (+ 1 curr-guesses))]
+         [(< number curr-guess)(display-msg (m-guess-high messages))(curr-game (+ 1 curr-guesses))]
+         [(equal? curr-guess number)(display-msg (m-win messages))]
+         [(= curr-guesses guesses) (display-msg (m-lose messages))])))
+    curr-game)
+;; starts the game
+  (module* main #f (m-start-game messages)((make-game (number)(max-tries)) 1))
\ No newline at end of file
diff --git a/number-guessing-game.rkt b/number-guessing-game.rkt
new file mode 100644
index 0000000..a2d7965
--- /dev/null
+++ b/number-guessing-game.rkt
@@ -0,0 +1,37 @@
+ #lang racket
+
+;; Coded by: Priya Mapara
+;; used https://medium.com/@gjorgigjorgiev/guess-my-number-game-in-racket-3b47fe15a652 as a reference.
+
+(displayln "Number Guessing Game ")
+(newline)
+(displayln "A simple program that will allow a user to enter a number.")
+(displayln "The user wil try to guess the number that is predetermined.")
+(displayln "If the number entered by the user is higher than the correct number,")
+(displayln "the phrase 'Too high. Try Again.' will be printed. If the number is lower ")
+(displayln "'Too Low. Try Again. will be printed.")
+(displayln "the number.")
+(newline)
+
+;; holds the content of the messages that will be displayed.
+(struct m (start-game guess-high guess-low win lose)) 
+(define messages(m "Enter a number from 1-100: "  "\nThe number you guessed is too high. Try Again. ""\nThe number you guessed is too low. Try Again. "
+                   "\n You gussed correctly!\n" "\nYou reached the maximum limit of guesses\n"))
+
+;; max number of tries
+(define (max-tries . args) 5)
+;; the number to be guessed
+(define (number . args) 68)
+;; scanning user input
+(define (user-guess . args)(read))
+;; displaying the messages and check cases
+(define (display-msg msg)(display msg))(define (make-game number guesses)(define (curr-game curr-guesses)
+    (let ((curr-guess (user-guess)))
+        (cond
+         [(> number curr-guess )(display-msg (m-guess-low messages))(curr-game (+ 1 curr-guesses))]
+         [(< number curr-guess)(display-msg (m-guess-high messages))(curr-game (+ 1 curr-guesses))]
+         [(equal? curr-guess number)(display-msg (m-win messages))]
+         [(= curr-guesses guesses) (display-msg (m-lose messages))])))
+    curr-game)
+;; starts the game
+  (module* main #f (m-start-game messages)((make-game (number)(max-tries)) 1))
\ No newline at end of file