I need help PLEASE

Processing Coding Questions
1 
int gameMode=0;//0 - menu, 1 - play game, 2 - instructions, 3 - character selection
int selChar=1;//default character is "character 1"
int level=1;
color red=color(255, 0, 0);
color green=color(0, 255, 0);
color blue=color(0, 0, 255);

boolean moveRight=false;
boolean moveLeft=false;
boolean moveDown=false;
boolean moveUp=false;

int x=50;
boolean[] keys=new boolean[128];

int[] v={4, 0};//horizontal and vertical velocity

int[] g1={0, 0, -968};
int[] g2={968, 0, -968};

PImage pic1;
PImage pic2;
int speed=-5;

int[] g3={0, 0, -108};
int[] g4={108, 0, -108};

PImage pic3;
PImage pic4;

PImage a;
PImage b;
PImage c;


void setup() {
  size(800, 600);
  a = loadImage("mario.png");
  b = loadImage("luigi.png");
  c = loadImage("Yoshi.png");
  pic1=loadImage("back.png");
  pic2=loadImage("back1.png");
  pic3=loadImage("ground1.png");
  pic4=loadImage("ground2.png");
}

void draw() {//runs forever
  background(red);
  if (gameMode==0){
    mainMenu();
  }
  else if (gameMode==1){
      playL1();
  }
  else if (gameMode==2)
    controls();
  else if (gameMode==3)
    select();
}//end draw

void playL1(){
  image(pic1, g1[0], g1[1]);
  image(pic2, g2[0], g2[1]);

  g1[0] = g1[0] + speed;//moving left
  if (g1[0] + speed < g1[2]) { 
    g1[0] = -g2[2];
  }
  g2[0] = g2[0] + speed;//moving left
  if (g2[0] + speed < g2[2]) {
    g2[0] = -g1[2];
  }
  
  image(pic3, g3[0], g3[1]);
  image(pic4, g4[0], g4[1]);
  
   g3[0] = g3[0] + speed;//moving left
  if (g3[0] + speed < g3[2]) { 
    g3[0] = -g4[2];
  }
  g4[0] = g4[0] + speed;//moving left
  if (g4[0] + speed < g4[2]) {
    g4[0] = -g3[2];
  }
  
} //end playL1

void controls() {
  textSize(35);
  fill(255);
  text("press spacebar to jump",150,150);
  text("move you characters", 150, 250);
  text("collect coins",150,350);
  text("avoid the enemies",150,450);
  backToMain();
}

void select() {//character select
  textAlign(LEFT);
  textSize(20);
  fill(0);//black
  //displaying all characters
  rect(200, 50, 100, 100);
  rect(350, 50, 100, 100);
  rect(500, 50, 100, 100);

  if (mouseIn(200, 50, 100, 100)) {
    fill(blue);
    rect(200, 50, 100, 100);
    if (mousePressed) {
      selChar=1;//1 could mean Mario
      gameMode=0;//main menu
    }
  }

  if (mouseIn(350, 50, 100, 100)) {
    fill(blue);
    rect(350, 50, 100, 100);
    if (mousePressed) {
      selChar=2;//2 could mean Luigi
      gameMode=0;
    }
  }

  if (mouseIn(500, 50, 100, 100)) {
    fill(blue);
    rect(500, 50, 100, 100);
    if (mousePressed) {
      selChar=3;//3 could be Yoshi
      gameMode=0;
    }
  }

  fill(255);
  text("Char 1", 210, 100);
  text("Char 2", 360, 100);
  text("Char 3", 510, 100);

  backToMain();
}//end select

void mainMenu() {
  textAlign(LEFT);
  textSize(35);
  fill(blue);
  text("START", 350, 430);
  text("INSTRUCTIONS", 290, 490);
  text("CHARACTERS", 295, 555);
  
  image(a, 200, 0, 150, 200);
  image(b, 80, 250, 200, 250);
  image(c,600,200,150,200);
  
  if (mouseIn(330, 400, 150, 35)) {//"play"
    fill(0);
    text("START", 350, 430);
    if (mousePressed) {
      gameMode=1;
    }
  }
  if (mouseIn(280, 460, 270, 35)) {//"instructions"
    fill(0);
    text("INSTRUCTIONS", 290, 490);
    if (mousePressed) {
      gameMode=2;
    }
  }
  if (mouseIn(285, 525, 240, 35)) {//"characters"
    fill(0);
    text("CHARACTERS", 295, 555);
    if (mousePressed) {
      gameMode=3;
    }
  }
  fill(255);
  textSize(60);
  text("Super Mario ", 230, 300);
}//end mainMenu

void backToMain() {
  textAlign(LEFT);
  textSize(20);
  fill(green);
  rect(20, 550, 120, 40);
  fill(blue);
  text("Menu", 50, 580);

  if (mouseIn(20, 550, 120, 40)) {//"back to menu"
    fill(0);
    text("Menu", 50, 580);
    if (mousePressed) {
      gameMode=0;
    }
  }
}//end backToMain

void movePlayer() {
  if (keys[39]) {//39 is the code for the RIGHT arrow key
    v[0]=4;
    moveRight=true;
  } else {
    moveRight=false;
  }

  if (keys[37]) {//37 is LEFT
    v[0]=-4;
    moveLeft=true;
  } else {
    moveLeft=false;
  }

  if (keys[40]) { //40 is DOWN
    v[1]=4;
    moveDown=true;
  } else {
    moveDown=false;
  }

  if (keys[38]) { //38 is UP
    v[1]=-4;
    moveUp=true;
  } else {
    moveUp=false;
  }
}//end movePlayer

void keyPressed() {
  //println(keyCode+" was pressed");
  //keys[keyCode]=true;
}

void keyReleased() {
  //println(keyCode+" was released");
  //keys[keyCode]=false;
}

//The function returns true if the mouse pointer is INSIDE the rectangle, otherwise returns false
boolean mouseIn(int left, int top, int w, int h) {
  return (mouseX > left && mouseX < left+w && mouseY > top && mouseY < top+h);
}//end mouseIn
2

This appears to be a duplicate post of this:

Please read:
https://discourse.processing.org/faq#keep-tidy

:)

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