First of all, you gotta make sure you have the following set-up:


-Giftboxer.
You need someone with the attack "Giftbox". It summons a giftbox, and if a character dies, it will revive! There's only three giftboxers in the game though. Those are RWQ, Funtime Foxy, and Crying Child. Just make sure you have one of them in your team!

-Shielder.
You need someone with the "Neon Shield" attack. It summons a shield that makes you invincible to the "Alarm" attack, which can kill you instantly. Endo 02 and Endoplush are the only ones that have this ability. However, this can be skipped, if you have the AUTO: Shield chip. Just change this slot with a attacker, a nightmare or a spring animatronic! (Fredbear/Spring Bonnie/Springtrap).

-Attackers to fill the other slots.
Nightmares are real good, but my best bet are the Springs. The Springlock attack can give 2000 damage when used!


-TWO giftboxers.
Yep. That's right. Two giftboxers. In-case the first team's giftboxer dies, switch team, use giftbox, switch Team back! The dead member will be revived, but without a giftbox. Use two just to make sure, but if you like playing risky, use one.

-Shielder.
Use the shielder in case the other team fails. Can be skipped if you have Auto:Shield.

Backup attacker.
Use Nightmares or Springs.

Bytes can be real useful!

My best bet is the best Medopod from zone 2 Lolbit and ALL the UFO bytes in Phinwheel Circus.
Why all? They give an insane amount of damage and give some good buffs. Even the smallest one is good. Take 'em all.

Chips can be indeed good, but i honestly don't count on them that much. However, Auto:Shield, Freddle:Fury, Auto:Regen, and Auto:Mimic are good. I don't remember the positions of others, but Auto:Shield can be found by going in the bird on the stump for 2 seconds. It will allow you to destroy the collision and walk through walls! Go to Lilygear lake and get the Red Chest. Be careful, the enemies in this glitched world are ♥♥♥♥♥♥♥ insane! They can kill you in seconds.

First of all, make sure you have the set-up. (no ♥♥♥♥ sherlock)
Spam Giftboxes, keep on the shield, and keep attacking. If the giftboxer of the main team dies, switch, use Giftbox, go back. It will revive. If the whole main team dies, you gotta use the second team, because you can't go back to it now. If you have a attacker that has debuffs like N. Freddy's sludge, use it, it makes the enemy slow. You will eventually win.

Welp. That's it! This works on Security, on the hard-mode final boss, and on Chipper's Revenge.
I tried to keep this as un-spoilery as possible.
I'm sorry if there are any grammar errors, make sure to point them in comments!
Feedback is of course welcome.