diff --git a/src/Main.gd b/src/Main.gd
index bf815a3..58afe82 100644
--- a/src/Main.gd
+++ b/src/Main.gd
@@ -13,6 +13,9 @@ export var color_correct: Color = Color()
 # An array of arrays of the letter nodes
 var letters := []
 
+var target_word: String
+var current_guess: int
+
 func _ready() -> void:
 	for _i in range(guess_count):
 		var letter_array := []
@@ -21,3 +24,68 @@ func _ready() -> void:
 			letter_array.append(letter)
 			$V/LetterGrid.add_child(letter)
 		letters.append(letter_array)
+
+	target_word = "godot".to_upper()
+	current_guess = 0
+
+
+func _on_GuessButton_pressed() -> void:
+	var guess_text_node := find_node("GuessText") as LineEdit
+	var guess := guess_text_node.text.to_upper()
+	guess_entered(guess)
+
+
+func _on_GuessText_text_entered(new_text: String) -> void:
+	guess_entered(new_text)
+
+
+func guess_entered(guess: String) -> void:
+	if current_guess >= guess_count:
+		return
+	guess = guess.to_upper()
+	if guess.length() != letter_count:
+		return
+
+	var letters_remaining = []
+	for letter in target_word:
+		letters_remaining.append(letter)
+
+	# Mark all greens
+	for i in range(letter_count):
+		var guess_letter := guess[i]
+		var target_letter := target_word[i]
+
+		var letter_instance := letters[current_guess][i] as ColorRect
+		letter_instance.get_node("Label").text = guess_letter
+		if guess_letter == target_letter:
+			letter_instance.color = color_correct
+			# Remove that one letter from remaining letters (is there a function for this?)
+			for j in range(letters_remaining.size()):
+				if letters_remaining[j] == guess_letter:
+					letters_remaining.remove(j)
+					break
+
+	print(letters_remaining)
+
+	# Mark all yellows (and grays)
+	for i in range(letter_count):
+		var letter_instance := letters[current_guess][i] as ColorRect
+		if letter_instance.color == color_correct:
+			# Ignore things that are already green
+			continue
+		var guess_letter := guess[i]
+		var found := false
+		for j in range(letters_remaining.size()):
+			if letters_remaining[j] == guess_letter:
+				found = true
+				letters_remaining.remove(j)
+				break
+		if found:
+			letter_instance.color = color_misplaced
+		else:
+			letter_instance.color = color_incorrect
+
+
+	current_guess += 1
+	var guess_text_node := find_node("GuessText") as LineEdit
+	guess_text_node.text = ""
diff --git a/src/Main.tscn b/src/Main.tscn
index 89be797..849ac0b 100644
--- a/src/Main.tscn
+++ b/src/Main.tscn
@@ -60,3 +60,6 @@ margin_left = 346.0
 margin_right = 460.0
 margin_bottom = 51.0
 text = "Guess"
+
+[connection signal="text_entered" from="V/H/GuessText" to="." method="_on_GuessText_text_entered"]
+[connection signal="pressed" from="V/H/GuessButton" to="." method="_on_GuessButton_pressed"]