In Kingdom Rush , Heroes begin at level 1 and gain experience during a level by attacking enemies, before maxing out at level 10. With each new level they gain a boost in their HP and attacking strength. When a level ends, the hero reverts back to level 1. Hero stats are rated on a scale of 0 to 8 in terms of Health, Attack, Ranged Attack and Speed. No defence is stated on the Hero page however fully detailed stats are listed when the hero is highlighted in a level. Heroes have two abilities, unlocked when they reach certain levels, and gain in power just as their other stats do.