Challenge Portal/ToC

PRE-MERGE
 * Challenge 1
 * Challenge 2
 * Challenge 3
 * Challenge 3.5
 * Challenge 4
 * Challenge 5

FIRST MERGER


 * First Rejoin (Part 1 & Part 2+3)

SECOND MERGER
 * Challenge 6
 * Challenge 7
 * Challenge 8
 * Challenge 9
 * Debut Challenge
 * Challenge 10
 * Challenge 11
 * Challenge 12
 * Challenge 13
 * Second Rejoin (Part 1 & Part 2+3)
 * Challenge 14
 * Challenge 15
 * Challenge 16
 * Challenge 17
 * Challenge 18
 * FINAL CHALLENGE