Guides

Moogle's First Seed: a video introduction to Worlds Collide Parts 1-4 by Ravlin and Vam. Contributions from WeffJebster
Moogle's First Seed Part 5 by MrEntity
If you want to play along with Moogle's First series, here are the seeds:

[Please note the Moogle's First Seed series was created using a deprecated version of Worlds Collide]

FF6WC Chest List - Includes chest locations per area with accompanying screenshots, as well as character gating and other pertinent data. Created by LordAnkou
Character Gate Maps With Treasure Counts - Treasure counts may be outdated. Created by Mina, updated by FalconHit
Treasure Chest Locations Part 1 Treasure Chest Locations Part 2 - Numebering refers to spoiler log order (see below). Created by Cecil

Treasure count by area - Created by DD_G, updated by franklin

doubledown's FF6 WC Guide (v1.4.2) - Created by doubledown
franklin's FF6 Worlds Collide Guide (v0.9) - Created by franklin
jack's Racing Tips (v0.9) - Created by jackimuswedge
Ravlin's Guide (v0.8) (or on Google Drive) - Created by Ravlin with contributions by Cecil, FutureForce14, Drewlith, jackimuswedge, and Mina
Ungated Checks (v0.8) - Video playlist including full playthrough plus individual checks; 4+ hours total playtime. Created by Ravlin

Boss Exploits Cheat Sheet - Created by MrEntity
Visual Guide to Final Kefka Tiers - Created by jackimuswedge
Rage Rankings - Tiered list of rages. Created by Raitzeno and Cecil
Steal Rankings - Tiered list of items stealable from enemies. Created by TheShwantz27
drewlith's Slots training video - 21 minute video tutorial. Created by drewlith
ATB Wait Tricking - 1 minute video demonstration. Created by TheSabin
ATB Wait Tricking - 10 minute video tutorial. Created by Xelpher
Zozo Clock Puzzle Example - Created by franklin
Airship Flying Tutorial - 15 minute video tutorial. Created by seto kiaba
Help Injured Lad Quest Objective - 6 minute video tutorial. Created by TheShwantz27

Algorithms FAQ (includes damage formulas, game mechanics) - Created by Terii senshi
Monster Scripts - Enemy battle scripts. Created by bover_87
FF6 Skills and Parameters - Detailed table of spells/skills. Created by Cecil
Enemy Exp-to-Level Ratio/Monster Table - Created by Cecil
Equipment Chart - Created by franklin. Thanks to DD_G, Xelpher for tables
Original Character Starting Stats
Fixed Dice damage calculation - Created by Rat
Additive Damage Multipliers Guide - Created by Cecil
Fight damage calculations - includes sheets for Hyper Wrist, Gauntlet, ValiantKnife - Created by franklin