The Heroic Challenge is a challenge for good players.
In order to unlock the Heroic Challenge on a level, the player must have got all three Stars/points for the Campaign mode of that level. The player only has one life and has to withstand six large waves of enemies.
Upgrade paths have a set limit on each challenge, increasing for higher levels. In the first ten levels in Kingdom Rush and the first four levels in Kingdom Rush: Frontiers, heroes are also not available. Completion of the challenge is rewarded with a Star; in addition, the flag of the respective area on the campaign mode map will gain golden wings.
In Kingdom Rush: Vengeance, there is no limit to available upgrades or the availability of a Hero. No points are awarded upon its completion, however, like all levels completed in the game, gems are awarded at the end. Having 3 stars on a level is also not necessary in order to unlock the Heroic Challenge.
- When playing a Heroic Challenge on a level that featured a boss, a result of the boss having been defeated can often be seen. For example, the Juggernaut's head is lying on the side of the road. This doesn't occur for all boss levels.