3 level 6 teslas have 225 combined dps... that should be enough to take care of most things entering the core.
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This base is good against hogs, and dragons but does really poorly against any "tank" through the middle type of attacks (so Pekka/Golems/Wizard Army). The only good advantage against those type is that there is alot of storages and junk around the Central island that'll redirect those troops and the mortar will splash damage them.