You build your dungeon up to withstand wave after wave of increasingly difficult enemies for a spot on the leaderboards. (thezombiechimp.com)
The intricate system not only creates far more interesting encounters, but it also allows for more difficult enemies in general. (mmorpg.com)
While mimics aren't necessarily difficult enemies in and of themselves, their small bodies and erratic movements make them hard to kill. (tomsguide.com)