Use blocks to path monsters into them, and use buildings to make monsters closer when they hit the trap. One of the best ways to place booby traps is in between 1 tile walls, when monsters are flung there they will immediately take the entrance (Unless the monster is Eye-Ra) and the monsters will be killed in the process. This is extremely useful with pokey armies, bolt armies and Project X. However it can be countered with defensive monsters eg Crabatron that will explode the mines or Eye-Ra that will bust down walls allowing another route .

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