I've been playing a bit of this recently. At first I couldn't even beat Easy. Then it took me a while to beat it on Medium. Hard I found incredibly difficult, many times losing before the 15th level, but I finally beat it on Hard with 1 life left. Here is a screenshot of it: Game can be played here: http://www.handdrawngames.com/DesktopTD/ If you play and want to see how you did compared to me, Medium and Hard allow you to submit your score to a group. My group is 'sngx1275', feel free to add your scores there. Probably just gave you guys a big hint with that screenshot, oh well.