Kingdom Rush. Kingdom Rush is a fantasy tower-defense game created by Ironhide Game Studio and sponsored by Armor Games. First released on 28 July 2011, it grew to be immensely popular and has racked up a total of over 70 million plays on Armor Games alone.
As has been said many times now, the Steam version has HD graphics with much better resolutions (you can play full screen on a big monitor and it'll look great).It also will come with all the heroes, for free. Though, you do have to beat certain levels to unlock them as you play but no extra money is involved.The mini-campaigns: Rising Tides and Shadowmoon will be patched into the Steam version later on FOR FREE - same with the other heroes that were released later on like Boneheart and Karkinos.Steam Trading Cards too, who really cares about those?