Solution: Meta 3: On the Beach
Answer: POOL TEAM MEETING

Written by aki and Jonathan

There are 3 separate meta puzzles taken from the normal puzzle round. After solving the prepuzzle, we have found that Waldo went back to three scenes in his very first book. Subsequently, we visit 26 locations, each of which belongs to one of the three given scenes.

Puzzle Answer
Battleships NAVAL COMMANDER
Dock YACHT TRAINEE
Jetty Creatures ZOOLOGISTS
Message in a Bottle LETTER FROM HAWAII
Sea Cave X AND Y ANNOUNCEMENT
Seashells BAZAAR DILEMMA
Shallow Waters FLIPPROOF
Swimming Area JOHN COLLIER
Under the Shade QUEEN OF THE GREEN
Watch Party KINDER EGG SURPRISES

As clued by the flavortext, we need to “split” out the letter pairs from each answer. We also notice that the answers are all of unique lengths, which gives us an ordering.

Length Answer Letter pairs
9 FLIPPROOF PO
10 ZOOLOGISTS O
11 JOHN COLLIER L
12 YACHT TRAINEE TE
13 BAZAAR DILEMMA AM
14 NAVAL COMMANDER M
15 QUEEN OF THE GREEN EE
16 LETTER FROM HAWAII TI
17 X AND Y ANNOUNCEMENT N
18 KINDER EGG SURPRISES G

Reading these letter pairs in order, we obtain the third location where Waldo can be found, the POOL TEAM MEETING.

Author's Notes

It was hilarious to us when cloning the GPH repo to find that their sample meta had precisely the same mechanic. Regardless, due to meta meta constraints, we needed a way to pull more letters into the meta answers, and so this meta was mostly forced in order to keep the “paired” letters idea at the same time.