Screams

Screams are the substance that both power your castle saving tons of money on electricity bills and allow you to place minions and traps. While captured, the Princess generates 50 screams every few seconds. The Scream generator creates 20 screams every few seconds, heroes can often drop 20 screams and the Mega Scream powerup allows you to place one trap for free, and refreshes all cooldowns; deleting a trap also spawns 20 screams. Once a Scream Generator creates 40 screams (2 pickups) it will stop functioning until at least one is picked up.