I Ace and collect all of the currently accessible single-player Goodies in the "Elephant Temple" level. Like with the previous level, there are a scant few tough spots but overall the level isn't too difficult.
Revisit: After getting the Blue Elephant Sticker in "Great Magician's Palace".
Now that I have the Blue Elephant Sticker, I quickly revisit the "Elephant Temple" level to pick up the rewards from the respective Sticker Switch. Then, I cover the Cooperative Challenge (and its exclusive Goodies) for this level.
Special thanks goes to the YouTube volunteer featured in this video (he is wearing the Monkey King free DLC Costume). His YouTube account is Spongebob1212X and his PSN ID is SpongebobFTW1.
If you're wondering why the Item Collection screen says +3 instead of the reality of +8, it's because we died too much and restarted the level. Thus, only the last three Goodies of the Cooperative Challenge registered on the Collection screen.