For anyone who needs help with the final boss. *SPOILERS*

[Slickums]

I heard some people were struggling with this boss, so I thought I'd post this guide. Hope it helps.

Preparation:

1. Have Purple Guy and Jack-O-Bonnie in your party for the slasher ability (only one of those two characters works well enough, though), someone who can use gift boxes to keep the party alive, and Nightmarionne for his bubble breath and 4th wall ability. You should only need one party, but keep characters with 4th wall, gift boxes, and buzzsaw in the second party just to be safe.

2. Use chips auto: mimic (to get more chances at the slasher attack), endless: speed (so it takes less time to get stuff done), auto: giftboxes (so you have a chance to set up abilities at the start without being too threatened), and auto: shield (so you can reduce damage done to you.)

3. Use 3 medi-bytes to be continously healed, and a block: 50 byte to ignore some damage.

The Start of the Fight:

After going through through the geist lair, you will end up finding the Purplegeist, a boss from a FNaF World prank game. However, Chica's Magic Rainbow will fall from the sky after about 4 seconds, crushing Purplegeist.

Attacks:

Chica's Magic Rainbow (CMR) has two ways of defending herself, one of them is sending mini rainbows at you which do damage, however, you can get rid of the mini rainbows using buzzsaw or 4th wall, 4th wall being the more reliable option. Be careful, though, as these mini rainbows can pile up very quickly, and they do a lot of damage. CMR's second attack is used after three minutes has gone on in the fight, after these three minutes are up, CMR will blast a large rainbow laser that will instantly kill you, meaning that you have to beat CMR before the laser is used.

Strategy:

As soon as the fight starts, you want to set up Nightmarionne's bubble breath to neglect poison damage during the fight, then start using slasher on CMR when she appears, it's a 1 out of 10 chance, but if you're lucky, slasher will deal 99999 against CMR. (remember that because of mimic being active, these 1 out of 10 chances become 1 out of 5.) Remember to also frequently use Nightmarionne's 4th wall attack to remove the mini rainbows CMR sends at you. If your first party goes down, switch to your second, use one of your characters to spawn in gift boxes, and then switch back to your first party. With enough successful slasher attacks, CMR will be beaten and you will be able to watch the ending.