diff --git "a/Retos/Reto #44 - ADIVINANZAS MATEM\303\201TICAS [Media]/java/Qv1ko.java" "b/Retos/Reto #44 - ADIVINANZAS MATEM\303\201TICAS [Media]/java/Qv1ko.java"
new file mode 100644
index 0000000000..6afd96fcea
--- /dev/null
+++ "b/Retos/Reto #44 - ADIVINANZAS MATEM\303\201TICAS [Media]/java/Qv1ko.java"	
@@ -0,0 +1,95 @@
+import java.util.Scanner;
+import java.util.Timer;
+import java.util.TimerTask;
+
+public class Qv1ko {
+
+    static boolean end = false;
+
+    public static void main(String[] args) {
+        riddle();   
+    }
+
+    private static void riddle() {
+
+        int x = 1, y = 1, ope1 = 0, ope2 = 0, operation = 0, correct = 0;
+        String[] operators = new String[] {"+", "-", "*", "/"};
+        double result = 0;
+        String answer = "";
+        
+        while (!end) {
+
+            ope1 =  (int)(Math.random() * (int)Math.pow(10, x));
+            ope2 = (int)(Math.random() * (int)Math.pow(10, y));
+
+            operation = (int)(Math.random() * 4);
+
+            if (operation == 0) {
+                result = ope1 + ope2;
+            } else if (operation == 1) {
+                result = ope1 - ope2;
+            } else if (operation == 2) {
+                result = ope1 * ope2;
+            } else if (operation == 3) {
+
+                while (ope2 == 0) {
+                    ope2 = (int)(Math.random() * (int)Math.pow(10, y));
+                }
+
+                result = ope1 / ope2;
+
+            }
+
+            answer = question(ope1, ope2, operators[operation]);
+
+            if (end) {
+                break;
+            } else if (Double.parseDouble(answer) == result) {
+
+                correct++;
+
+                if (correct % 5 == 0) {
+                    if (x > y) {
+                        y++;
+                    } else {
+                        x++;
+                    }
+                }
+
+            } else {
+                end = true;
+            }
+
+            System.out.println(ope1 + " " + operators[operation] + " " + ope2 + " = " + result);
+
+        }
+
+        System.out.println("You got " + correct +  " questions correct");
+
+    }
+
+    private static String question(int num1, int num2, String operation) {
+
+        Scanner sc = new Scanner(System.in);
+        String answer = "";
+
+        Timer timer = new Timer();
+        timer.schedule(new TimerTask() {
+            public void run() {
+                System.out.println("\nThe time is over");
+                end = true;
+            }
+        }, 3000);
+
+        try {
+            System.out.print(num1 + " " + operation + " " + num2 + " = ");
+            answer = sc.nextLine();
+        } finally {
+            timer.cancel();
+        }
+
+        return answer;
+
+    }
+
+}
diff --git "a/Retos/Reto #45 - EL CALENDARIO DE ADEVIENTO 2023 [F\303\241cil]/java/Qv1ko.java" "b/Retos/Reto #45 - EL CALENDARIO DE ADEVIENTO 2023 [F\303\241cil]/java/Qv1ko.java"
new file mode 100644
index 0000000000..fd8527e550
--- /dev/null
+++ "b/Retos/Reto #45 - EL CALENDARIO DE ADEVIENTO 2023 [F\303\241cil]/java/Qv1ko.java"	
@@ -0,0 +1,123 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+
+class Qv1ko {
+
+    public static void main(String[] args) {
+        calendar();
+    }
+
+    private static void calendar() {
+
+        ArrayList<String> participants = new ArrayList<String>();
+        String participant = "";
+        int position = 0;
+        boolean on = true, exit = false;
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        while (!exit) {
+            
+            System.out.print("\n1) Add participant | 2) Show participants | 3) Delete participant | 4) Carry out the draw | 5) Exit\nSelect one option: ");
+
+            try {
+                switch(br.readLine()) {
+
+                    case "1":
+
+                        System.out.println("\nAdd participant\n");
+
+                        System.out.print("Name: ");
+                        participant = br.readLine();
+
+                        for (String p : participants) {
+                            if (participant.equalsIgnoreCase(p)) {
+                                System.out.println("\nThe participant already exists\n");
+                                on = false;
+                                break;
+                            }
+                        }
+
+                        if (on) {
+                            participants.add(participant);
+                        }
+
+                        break;
+
+                    case "2":
+
+                        System.out.println("\nList of participants\n");
+
+                        for (int i = 0; i < participants.size(); i++) {
+                            System.out.println("- " + participants.get(i));
+                        }
+
+                        break;
+
+                    case "3":
+
+                        if (participants.size() > 0) {
+
+                            System.out.println("\nDelete participant\n");
+
+                            System.out.print("Name: ");
+                            participant = br.readLine();
+
+                            for (int i = 0; i < participants.size(); i++) {
+                                if (participant.equalsIgnoreCase(participants.get(i))) {
+                                    participants.remove(i);
+                                    on = false;
+                                    break;
+                                }
+                            }
+                            
+                            if (on) {
+                                System.out.println("\nParticipant does not exist");
+                            } else {
+                                System.out.println("\nThe participant has been eliminated");
+                            }
+
+                        } else {
+                            System.out.println("\nNo participants");
+                        }
+
+                        break;
+
+                    case "4":
+
+                        if (participants.size() > 0) {
+
+                            position = (int)(Math.random() * participants.size());
+                            System.out.println("\nThe winner is " + participants.get(position));
+    
+                            participants.remove(position);
+                            
+                        } else {
+                            System.out.println("\nNo participants");
+                        }
+                        
+                        break;
+
+                    case "5":
+                        
+                        System.out.println("\nLeaving...\n");
+                        exit = true;
+                        break;
+
+                    default:
+                        System.out.println("\nSelect a number");
+                    
+                }
+
+                on = true;
+
+            } catch (IOException exc) {
+                System.out.println("\nInput error\n");
+            }
+
+        }
+
+    }
+
+}
diff --git a/Retos/Reto #46 - LA CARRERA DE COCHES [Media]/java/Qv1ko.java b/Retos/Reto #46 - LA CARRERA DE COCHES [Media]/java/Qv1ko.java
new file mode 100644
index 0000000000..cc907a1a9e
--- /dev/null
+++ b/Retos/Reto #46 - LA CARRERA DE COCHES [Media]/java/Qv1ko.java	
@@ -0,0 +1,125 @@
+public class Qv1ko {
+
+    private static char END = '#';
+    private static char ROAD = '_';
+    private static char TREE = 'T';
+    private static char CAR = '<';
+    private static char SHOCK = 'x';
+    
+    public static void main(String[] args) {
+        race();
+    }
+
+    private static void race() {
+
+        int turn = 1;
+        boolean shockCar1 = false, shockCar2 = false;
+
+        String track1 = trackGenerator();
+        String track2 = trackGenerator();
+
+        System.out.println("\nSTART\n");
+
+        System.out.println(track1);
+        System.out.println(track2);
+
+        while (track1.toCharArray()[0] != CAR && track2.toCharArray()[0] != CAR) {
+
+            try {
+                Thread.sleep(10000);
+            } catch (InterruptedException exc) {
+                exc.printStackTrace();
+            }
+
+            System.out.println("\nTurn " + turn + "\n");
+
+            if (!shockCar1) {
+
+                track1 = advance(track1, (int)(Math.random() * 3) + 1);
+
+                for (char element : track1.toCharArray()) {
+                    if (element == SHOCK) {
+                        shockCar1 = true;
+                        break;
+                    }
+                }
+
+            } else {
+                shockCar1 = false;
+            }
+
+            if (!shockCar2) {
+
+                track2 = advance(track2, (int)(Math.random() * 3) + 1);
+
+                for (char element : track2.toCharArray()) {
+                    if (element == SHOCK) {
+                        shockCar2 = true;
+                        break;
+                    }
+                }
+
+            } else {
+                shockCar2 = false;
+            }
+
+            System.out.println(track1);
+            System.out.println(track2);
+
+            turn++;
+
+        }
+
+        if (track1.toCharArray()[0] == track2.toCharArray()[0]) {
+            System.out.println("\nThe race ended in a tie");
+        } else {
+            System.out.println("\nThe race winner is " + ((track1.toCharArray()[0] == CAR) ? "car 1" : "car 2"));
+        }
+
+    }
+
+    private static String trackGenerator() {
+
+        String road = "";
+        int trees = 0;
+
+        for (int i = 0; i < 10; i++) {
+            if (trees < 3 && (int)(Math.random() * 10) < 3) {
+                road += TREE;
+                trees++;
+            } else {
+                road += ROAD;
+            }
+        }
+
+        return END + road + CAR;
+
+    }
+
+    private static String advance(String track, int positions) {
+
+        String clearTrack = "", newTrack = "";
+        int newPosition = 0;
+
+        for (int i = 0; i < track.length(); i++) {
+            if (track.toCharArray()[i] == CAR || track.toCharArray()[i] == SHOCK) {
+                newPosition = (i - positions < 0) ? 0 : i - positions;
+                clearTrack += '_';
+            } else {
+                clearTrack += track.toCharArray()[i];
+            }
+        }
+
+        for (int i = 0; i < clearTrack.length(); i++) {
+            if (i == newPosition) {
+                newTrack += (clearTrack.toCharArray()[newPosition] == TREE) ? SHOCK : CAR;
+            } else {
+                newTrack += clearTrack.toCharArray()[i];
+            }
+        }
+
+        return newTrack;
+
+    }
+
+}
diff --git "a/Retos/Reto #47 - LA PALABRA DE 100 PUNTOS [F\303\241cil]/java/Qv1ko.java" "b/Retos/Reto #47 - LA PALABRA DE 100 PUNTOS [F\303\241cil]/java/Qv1ko.java"
new file mode 100644
index 0000000000..99705d7e5d
--- /dev/null
+++ "b/Retos/Reto #47 - LA PALABRA DE 100 PUNTOS [F\303\241cil]/java/Qv1ko.java"	
@@ -0,0 +1,37 @@
+import java.util.HashMap;
+import java.util.Scanner;
+
+class Qv1ko {
+
+    public static void main(String[] args) {
+        wordPoints();
+    }
+
+    private static void wordPoints() {
+
+        HashMap<Character, Integer> letterPoints = new HashMap<Character, Integer>() {{ put('a', 1);put('b', 2); put('c', 3); put('d', 4); put('e', 5); put('f', 6); put('g', 7); put('h', 8); put('i', 9); put('j', 10); put('k', 11); put('l', 12); put('m', 13); put('n', 14); put('ñ', 15); put('o', 16); put('p', 17); put('q', 18); put('r', 19); put('s',  20); put('t', 21); put('u', 22); put('v', 23); put('w', 24); put('x', 25); put('y', 26); put('z', 27); }};
+        String word = "";
+        int points = 0;
+        Scanner sc = new Scanner(System.in);
+        
+        while (points != 100) {
+
+            points = 0;
+            
+            System.out.print("Type a word: ");
+            word = sc.nextLine().toLowerCase();
+
+            for (char letter : word.toCharArray()) {
+                points += letterPoints.get(letter);
+            }
+
+            System.out.println("The word " + word + " has " + points + " points");
+
+        }
+
+
+        sc.close();
+
+    }
+
+}