Mobility in all directions is important in avoiding the Eye of Cthulhu's attacks, and chances are that you won't have access to such items as or . Due to the player's limited jumping skills, it is strongly advised that you build a boss arena that consists of multiple rows of wooden platforms. Finally, the arena should have some tall walls to keep other enemies from entering the arena, though a ceiling isn't required. With no ceiling, , , and that are thrown upwards would fall back into the arena, and can still damage the Eye of Cthulhu during the descent. Keep in mind that the EoC and its Servants are immune to .
As the Eye of Cthulhu can only summon itself if your max HP is 200 or more, you can delay its arrival by holding onto any Life Crystals that will increase your max HP to 200 or more until you feel that you're ready. That way, you'll be able to wait until you can craft and a . However, if you're not patient enough to want to grind for gold-tier equipment, then you should at least have or better, an or better, and, most importantly, some sort of ranged weapon, such as , , or a (preferably or stronger) with . Also, bring along any in case you need to heal. If possible, get for instead.
|Eye of Cthulhu Trophy|
The Eye of Cthulhu has two phases that it goes through as it battles with the player. The first phase, a giant eye, has 15 attack power and 12 defense, while the second phase, a giant eye with a gaping jaw in place of its lens, has a 23 attack power; however, it has no defense.A good weapon to use during the first phase is the : It being a broadsword means you are able to fend off The Servants Of Cthulhu and use its ranged ability to fight Cthulhu. Another weapon suggestion for the first phase would be the . (It is advised that the player has full as this makes the use 0 .) The can also be useful when the Eye is simply hovering, as it will kill the Servants easily and allow the player to focus on the Eye. It can also deal a good bit of damage when the Eye is switching phases as it will stay stationary when doing so.
If these conditions are met, the player may get the message, "You feel an evil presence watching you...", which means that the Eye will spawn soon. After about 15-30 seconds the message, "The Eye of Cthulhu has awoken!" will appear and the boss will promptly start to attack the player. However, if the player isn't ready to fight the Eye of Cthulhu, the battle can be cancelled by simply exiting and restarting the world, or alternatively restarting the game.