I am small, but, when entire,
of force to set a town on fire;
Let but one letter disappear,
I then can hold a herd of deer;
Take one more off, and then you'll find
I once contained all human kind.
Answer: Spark.
This riddle appears in the following downloadable PDF files:
Can you solve one of the most famous logic puzzle ever?
Memory Matching game for kids, adults and seniors.
Connect the matching tiles and pop them all.