Darkness reigns. Only areas near towers are visible. Enemies in darkness are invisible!
Light Tower (40g): Large vision radius, no damage. Essential for revealing enemies.
Combat Towers: Archer, Cannon, Ice - all have small vision. Build light towers to expand.
Reveal Tower (100g): Detects invisible Shadow enemies.
Flare (20s CD): Illuminate entire map for 3 seconds. Bonus points for NOT using flares!
Lanterns (10g): Place on path for small permanent light. One-time use per placement, 3 per wave.
Night creatures: +50% HP when in darkness. Shadow enemies invisible even in light.
Bats: Fly over towers, attack light sources. Werewolves at wave 10+.
Day/Night cycle: Every 5th wave is "day" - full vision! Otherwise night.