Replay Levels
Remember you can always return to levels with more Heroes and upgrades at a later date if you didn't get a 3 star on your first attempt.
Infantry Towers
To get maximum effect from your Infantry Towers you should group them near Bow or Magic Towers
Hero Powers
Don't waste your hero powers, each one has an area where they are most effective so be sure you hit the trigger accordingly.
Make upgrading your Heroes your priority as doing so will unlock extra abilities that will help you defeat your foe in battle.
Reinforcements
When you need help in battle remember the small icons on the bottom right of the screen to get Elixir donations and reinforcements. Elixer donations allow you to build more Towers and reinforcements act as an additional hero.
Choke Points
A successful strategy will usually involve having choke points, these are areas where the path gets narrow forcing the enemy to push their way through and putting them at a disadvantage as it pins them in a small area making it easier to eliminate them.
Daily Chest
Remember to collect your daily free Chests, you will recieve notifications when it is ready.
Creep Book
Make sure you study the Creep Book so you know your Enemies strengths and weaknesses so you can devise a strategy to take advantage them.
Quests
Try to complete as many quests as you can as doing so will earn you the resources needed to make your Heroes stronger.
If you sign into Facebook you will be able to send and recieve charges to your friends for your Sentinel Tower.