This is a ballpark simulator, not the real game. Block HP and every trap's damage/power draw are taken directly from the game files. The one thing that isn't in the files anywhere is zombie attack damage — those are reasonable estimates for testing purposes, not hard fact. It also only models your walls and traps, not you shooting — think of it as testing a passive "trap base," not a full fight. Traps are walked straight through, not blocked — real zombies never "fight" a single-height spike or blade trap, they walk over it taking damage each pass while the trap wears down; only actual walls stop them.