🎮 The Konami Code: Gaming’s Most Legendary Cheat (with JavaScript Example!)

The Konami Code—also known as the “Konami Command” (Japanese: コナミコマンド)—is perhaps the most famous cheat code in video game history. First appearing in Konami’s classic titles, this secret sequence has become a symbol of gaming culture, even showing up in non-Konami games, websites, and pop culture references.

The code itself is simple, but its influence is massive. A nod to the golden age of gaming, it unlocks Easter eggs, secret levels, or surprise features. Here’s how you can add the magic of the Konami Code to your own website or app!

🕹️ The Konami Code Sequence

up, up, down, down, left, right, left, right, B, A

✨ Add the Konami Code to Your Website with JavaScript

Copy and paste this simple JavaScript snippet into your website to create your own hidden Easter egg! When a user enters the Konami Code using their keyboard, an alert will appear.

<script type="text/javascript">
if(window.addEventListener) {
  var keys = [], konami = "38,38,40,40,37,39,37,39,66,65";
  window.addEventListener("keydown", function(e) {
    keys.push(e.keyCode);
    if(keys.toString().indexOf(konami) >= 0) {
      (function(){
        alert('Ha! You have successfully unlocked the full potential of this site. Enjoy.');
      })();
      keys = [];
    }
  }, true);
}
</script>

💡 What is the Konami Code?

Originally created as a cheat in the 1986 game Gradius for the NES, the Konami Code quickly spread to other Konami games like Contra, where it famously granted 30 extra lives. Over time, it became an inside joke among developers and a beloved secret among players.

🏆 Why is the Konami Code So Popular?

• Universal recognition: Instantly recognizable to generations of gamers.
• Pop culture legend: Referenced in TV shows, movies, and even on non-gaming websites.
• Unlocks surprises: Used for cheats, jokes, or hidden features—Easter eggs galore!

Next time you want to reward your users with a clever secret, try adding the Konami Code to your project. Happy coding!