The Eye of Cthulhu is one of the many bosses in the Mobile Version of Terraria. The boss can be summoned with a Suspicious Looking Eye, or will randomly spawn at night after a certain criteria has been met. After defeating the boss in a world, it will no longer spawn randomly.
One of the best strats to beat the eye of cthulu is to build a long wooden platform and use shurikins and a good bow (maybe gold or platinum)
The eye of cthulhu is the very first boss and has 3000 health and 15 damage. When he reaches 1400 health he goes into a secound form which has 28 damage.