Moved from my fansite.
There are several tactics for great defensive setups. None are actually 'wrong' per se - some people prefer their own thing.
Tip 1 - The Road Less Traveled: From what I have seen thus far, most monsters will take the quickest route to their target. This doesn't mean they will attack the wall closest to a tower but I have a feeling the AI for the monsters takes into consideration attacking walls verse walking around them when it comes to attacking. What I mean is this... if a group of monsters are slung in front of your 10 block long wall and there is a tower directly behind it, they will attack through the wall to get to the tower.
If that same wall was say, 5 blocks long, the monsters will run around it to get to the tower.
If you calculate the time it takes for ONE monster to kill the wall verse walking around, the quickest route wins. Even though you may have 10 or 20 monsters, I don't think the AI checks that. Also, when you have walls built 2+ deep, the monsters will almost always find an open gap somewhere (assuming there IS one) and walk around.
So generally speaking, you want to give the enemy AI a run for their money. Build your defenses to force the invading army to go where YOU want it to. So you could build a wall that is 10 long and 2 deep to try and force the enemy to run around. This gives your towers time to whittle away at the enemy and will force them directly around the wall, so a few well placed Booby Traps will give them something to think about
Tip 2 - Back Me Up! : When placing towers, one of the main things you need to take in to consideration is a group of monsters can kill a single tower with minimal casualties. You need to test the range of your towers and make sure each tower has at least one other tower within it's defense range. What this means is when a group of monsters attack Tower A, Tower B will assist in defending Tower A while it's being attacked. Ideally you will want each tower to have 2-3 other towers within range. For beginners this will be tough as low level Splash towers have hardly any range. When getting your towers to level 3+ their range will be great enough to cover other towers.
Tip 3 - Prioritize! : When building your defenses you need to prioritize your buildings from most needed to can live without. Your main buildings go in this order; Town Hall, Silo, Monster Housing (when an army is already built), Factories and then everything else. Your main concern is to keep them protected in that order. There are many different strategies but the best one seems to be surrounding your Town Hall and Silos with Brick Walls (possibly a second wall of Wooden Walls), placing your Factories and Towers around your Town Hall setup and then another Wooden Wall around those structures. You will want to keep your Housing as close to towers as you can.
Tip 4 - Sling 'em! : One main factor most people don't know is the opponent has a minimum amount of distance he must be to sling his monsters in. This is usually (approx.) an inch (on your monitor) away from your furthest building. An enemy cannot sling his troops directly next to or past your buildings. The best way to control where he can place his monsters is by placing your 'loose' buildings around your base on the outside. Always leave them within range of a Snipe Tower. The monsters will either a) attack the building or b) walk around it to the tower. Regardless of what happens, your towers will have a great advantage when defending. They will be able to hit the monsters while they move or are attacking a building.
Tip 5 - Disillusionment : One strategy I have found to work on several occasions is to have several low level Factories placed on the opposite side of your base with minimal defense. These full up quickly and most people will fall for the bait. There are several full ! factories and only one tower defending it... sweet! This will keep your Town Hall clear on some occasions.
Tip 6 - Brawn Before Beauty : Some people may disagree with this but it works for me, quite well. When placing your towers behind walls, place your higher level towers in front, not your lower level ones. Your low level towers will get eaten through very quickly. It will take monsters longer to destroy your higher level ones. This means more overall damage. This doesn't mean stick your high level towers out undefended. This is mainly for Snipe's as they have decent range even at low levels. If you have a low level splash, place it within range of a Snipe tower so it can attack while the Snipe is under fire.
More to come (images as well).










