About X-Trial Racing GameZombie Killer is a 20-stage zombie defense game where you alternate shooting at incoming zombies which run across three different rows. Use the income generated from each campaign to invest in upgrades like faster shooting, greater damage, double bullets, more health, faster helicopter support fire rate, and two additional guns (which can also be upgraded). Players can use the on-screen control buttons or a keyboard to play. Change rows using the up and down arrow keys. Shoot using by pressing the A key and use the S key to call in helicopter support. Try to hit the zombies with range attack and do not let any reach the left edge of the screen or you lose. This is a JavaScript web application which uses cross-platform mobile-friendly HTML. All modern web browsers like Microsoft Edge, Apple Safari, Google Chrome, Mozilla Firefox and Opera should support it. This game works on just about any type of computing device including Microsoft Windows desktop computers, Apple OSX Mac computers, iOS powered tablets and phones like the iPad and iPhone, laptops like the Google Chromebook, and the many types of mobile phones from manufacturers like Samsung which are powered by Google Android.