Tips and tricks

Base type and layout
Do not build the base too close to Summoning Stones, as Bomb Towers may draw their attention when attacking zombies (Should not be a worry after you get a few tiers in as in these mobs will drop fast. Make sure the mostly symmetrical. The space of were you can place is 36 X 36 (Whole 1,296 squares and 324 squares per quarter (0.25 or 3/4)).

Corner Base
Corner base is a type of base for a corner and is usually build in a corner. You'll need mostly crossbows cause they can shoot farther than cannons after tier II but being on tier VIII you can shoot same range as the bomb tower. And the amount of the towers you can place when you are solo is the amount needed for the corner base (except the harvester cause you'll need 5). Before you start base you have to make sure no other towers (except harvester is behind or 3/4 of the area where you can't place or else because the harvester is the only tower that doesn't count as a tower). You'll need total of 324 squares where you can place towers. You'll need about 360 wood and 360 stone for the buildings (Harvester not included) but at least 600 wood and stone just incase of buildings to repair and upgrade. If your base is close to a resource let the harvester be able to reach it cause you can gather with them instead of just letting them sit there having no use.

Square Base
A square base by yourself is good to get gold and resources quickly. However, if you want a high score, then you need a max party to optimize your chances. Before you start, get at least 1K+ of stone and wood. Find an area that is dense with natural obstacles, including at least 1 combo. Place your gold stash in the middle of it.

Note: Square bases may not survive longer than other type of bases

Tricks and Tips

 * harvester is the only tower that doesn't count as a tower
 * doors and walls make zombies more powerful or violent
 * use alts/bots/clones/ whatever you call them to use them to help upgrade and get more resource (you'll have more zombies spawn)
 * keep upgrading your defenses and repairing any damage
 * you should be able to last a long time
 * if you are playing on multiple tab close them once you have maxed out everything so less zombies spawn
 * tier IV (4) pickaxe is good enough but suggest to upgrade it once you have max out the base
 * tier VI (6) spear can do good and can go max it's tier once you have all buildings max
 * best to use bomb in a safe place and equip with CARL
 * be sure to upgrade CARL ASAP because later on it'll be hard to level CARL
 * every 9th waves (9, 18, 36, etc. (not gonna do all the math here)) well have a boss