diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e420ee4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+target/*
diff --git a/rust-book/chapter-1/guessing_game/.gitignore b/rust-book/chapter-1/guessing_game/.gitignore
index 53eaa21..088ba6b 100644
--- a/rust-book/chapter-1/guessing_game/.gitignore
+++ b/rust-book/chapter-1/guessing_game/.gitignore
@@ -1,2 +1,10 @@
-/target
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
 **/*.rs.bk
diff --git a/rust-book/chapter-1/guessing_game/Cargo.toml b/rust-book/chapter-1/guessing_game/Cargo.toml
index 237179e..db0cb69 100644
--- a/rust-book/chapter-1/guessing_game/Cargo.toml
+++ b/rust-book/chapter-1/guessing_game/Cargo.toml
@@ -7,4 +7,5 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-rand = "0.3.14"
+rand = "0.4.0"
+ferris-says = "0.1"
diff --git a/rust-book/chapter-1/guessing_game/src/main.rs b/rust-book/chapter-1/guessing_game/src/main.rs
index 4fc83aa..bccadda 100644
--- a/rust-book/chapter-1/guessing_game/src/main.rs
+++ b/rust-book/chapter-1/guessing_game/src/main.rs
@@ -1,19 +1,27 @@
+use ferris_says::say;
+use rand::Rng;
 use std::io;
 
 fn main() {
     println!("Guess the number!");
 
+    let secret_number = rand::thread_rng().gen_range(1, 101);
+
+    let stdout = io::stdout();
+    let output = b"I will generate a number!";
+    let width = 28;
+
+    let mut writer = io::BufWriter::new(stdout.lock());
+    say(output, width, &mut writer).unwrap();
+
+    println!("The secret number is {}", secret_number);
+
     println!("Please input your guess.");
 
     let mut guess = String::new();
-
     io::stdin()
         .read_line(&mut guess)
         .expect("Failed to read line");
 
     println!("You guessed: {}", guess);
 }
-
-fn test(arg: String) -> String {
-    unimplemented!()
-}