I write for you a script to use in http://freebitco.in/?r=508294 .
This site is a free lottery, you can multiply your balance with free game "multipling bitcoin".
In Firefox you can open "console" with key "F12".
Then you can paste this:

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bconfig = {
  maxBet: 0.00000512,
  wait: 3000,
  toggleHilo:true
};
 
hilo = 'hi';
multiplier = 1;
rollDice = function() {
 
  if ($('#double_your_btc_bet_lose').html() !== '') {
    $('#double_your_btc_2x').click();
    multiplier++;
    if(bconfig.toggleHilo)toggleHiLo();
  } else {
    $('#double_your_btc_min').click();
    $('#double_your_btc_2x').click();
     multiplier = 1;
  }
 
  if (parseFloat($('#balance').html()) < (parseFloat($('#double_your_btc_stake').val()) * 2) ||
    parseFloat($('#double_your_btc_stake').val()) > bconfig.maxBet) {
    $('#double_your_btc_min').click();
  }
 
  $('#double_your_btc_bet_' + hilo + '_button').click();
 
  setTimeout(rollDice, (multiplier * bconfig.wait) + Math.round(Math.random() * 100));
};
 
toggleHiLo = function() {
  if (hilo === 'hi') {
    hilo = 'lo';
  } else {
    hilo = 'hi';
  }
};
 
rollDice();

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This is a script that automatically bet your bitcoin and multiply your earnings