Answer:
I know a word of letters three, add two and less there will be.
Even if you throw it away, it still comes back.
It is where kings, queens, knights and bishops go to war together.
What gets bigger the more you take away from it?
It comes from crystal and melts to a treat. Add it to your tea to make it sweet. What is it?
Cycle Cycle Cycle.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?