Pandaemonium, Kingdom Rush. No hero [Hard Veteran] 3 stars.

Beating Kingdom Rush's Pandaemonium on steam on hard mode (veteran mode on android/iOS) without using a hero, finishing with 20 hearts, and selling all towers before level ends.
Hard and Veteran are the same thing... (for more info click Show More...)
This game on the phone/iOS/android the difficulty levels are called (Casual, Normal, and Veteran) but before an update, on Steam/Flash it was called (Easy, Normal, and Hard). Veteran and Hard are the same thing, it just depended on what platform you played on. The Kingdom Rush wiki also points this out. There has been as update on the steam version since this video was posted that now shows the difficulty level as (Casual, Normal, and Veteran), but the actual difficulty setting stayed the same, this video was made before the update.