var list = ""
var items = [];
var item=[];
var counter = 1;
var savedCount= 0;
var useSaved=false;
var bbPos = []
var used =[]
var needed=25;
var used=false;
var rnum=Math.floor(Math.random()*needed);
var done =false
var counterR = 0;
var round1=true;
var usedNum = false;

function freeSpace(){
  if(items[25]!=null){
    alert("you have to many items for a free space")
  }
  else{
    needed=24
 if(document.getElementById("freeSpacer").value == "yes"){ 
   document.getElementById("freeSpacer").value = "no"
   bbPos[13] = "Free Space!"
 }
  else{
    document.getElementById("freeSpacer").value = "yes"
}
  
}
}
function enter(){
  if(counter<=needed){
    if(useSaved==true){
      items[counter] =  document.getElementById("items").value;
  document.getElementById("items").value = ""; 
  document.getElementById("item"+counter).innerHTML =  counter + ". " +items[counter];
  counter=savedCount;
    }
    else{
  items[counter] = 
  document.getElementById("items").value;
  document.getElementById("items").value = ""; 
  document.getElementById("item"+counter).innerHTML =  counter + ". " +items[counter];
  counter+=1;
    }
  }
  else{
    document.getElementById("output").innerHTML="You are out of room for your bingo board";
  }
}

function start(){

  if(items[needed]!=null){
    counter =1;
    for(i=0;i<=needed;i++){
      checker1();
      document.getElementById("box"+counter).innerHTML= used[i];
      counter+=1;
    }
   
  }
  else{
    alert("you do not have enough items to fill your board");
  }
}
function checker1(){
  needed-=1;
  rnum=Math.floor(Math.random()*needed);
  needed+=1;
  for(i=0;i<needed;i++){
    if(rnum==used[i]){
      usedNum=true;
    }
    else{
      usedNum=false;
    }
  }
  if(usedNum==true){
    checker1();
  }
  else if(usedNum==false){
   used[counterR]=rnum;
   counterR+=1;
  }
  
  
}

Bassicaly I think my issue lies in the checker function. Whats supposed to happen is a for loop runs checker however many times it needs (25 or 24) to set that many random numbers into an array and check if that number has been used. Instead what happens is only the 0 posistion is set to undefined and im extremely confused why. Pardon my exsessive variable usage and crappy code. If anyone knows why this is happening it would be appreciated