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A good tactic is to use auto-traps as they will activate whenever an enemy is in range.
A good strategy is to place spear guns near ladders as this will enable you to cover multiple floors.
A good strategy is to focus your resources on upgrading the traps that you have, particulary those that are best-suited for your playing style as unlocking new traps and minions is expensive and they will be weak to begin with.
More often than not the heroes will come through the front door but don't forget to guard the windows because it they decide to come in via that route you will find yourself in trouble.
Ceiling traps are very effective when you encounter a situation where things are crowded at ground-level as they are powerful and lethal. Placing acid-drippers above ladders also works particularly well.
You can always earn extra Doom-shekels by replaying levels. If the princess is never captured by the heroes you will also get bonus Doom-shekels.
Use minions when you find that the heroes are getting the upper hand as they can go anywhere which means that you do not have to worry about placing them properly amongst all the traffic.
A good strategy is to place Scream Generators up on higher levels as this gives you the opportunity to thin out the heroes forces by laying out traps in their path to reach those generators. Remember though that heroes are able to enter through windows.
Make sure you lay down Scream Generators during the few seconds at the start of a level before the heroes break down the gate. Placing the Scream Generators then will ensure that you are kept supplied through the attack.