Best WC3 Tower Defense maps

well first of all you mustnt pick all 6 elements. There are many people who pick all lvl 1 elements and that way they can only pick 4 (or 5?) level 2 elements. This has for consequence that you can build only very few boss towers.

What i always do is putting 4 slowing towers in the middle of the map (after first curve). You have to spread them of course, to allow them to shoot in a crossfire. As slowing towers i define ice towers (most effective), windstorm towers (boss windstorm towers can paralyze loads of ennemies) or root towers. Next to the slowing towers i build lots of damage dealers. Perfect damage dealers are fire or earth towers (not the pure ones). But this may depend on the version of the map. Anyways, towers which can level up with every kill are quite useful, eg the tsunami tower. There are others who increase attacking speed with every kill (ex: zealot). If you build the slowing towers correctly, creeps will be blocked in the middle and damage dealers will rape them. A bit further i recommend to build a money tower. Usually only creeps with red health bar will get out of the middle and the money tower will easily pick them up (up to level 40 they are very effective). This will give you extra money to build more damage dealers. Forget life towers, they suck.

On the upper building area you should build a flesh golem. This is my favourite tower. First of all, this guy is able to move. On first level he has only poor basic damage but with every kill he grows additional damage. On level 2 he is really imba. 45 000 basic damage and i think additional damage through kills gan go up to 200 000. Because he is able to move, he can kill the last survivors who were able to escape from the blocking area. If you werent able to build the flesh golem, try to build towers with huge attacking range and towers which can spawn their own creeps.

Once i build it in a way that my computer crashed at the end because there were too many ronalds on the map :D