The Yellow Tower is the tunnel route. The tower is around 3310, 1560; the Yellow Tunnel entrance is around 3500, 1620. These are the most communication-heavy tower puzzles and a good place to use radios, lanterns and short callouts.
1. Easter Egg Hunt — 3370, 1490
Search the whole arena for four colours of wooden pieces. There are nine pieces of each colour, including pieces on trees, rocks, the main red area and the nearby rail. One green piece is reached through an orange side tunnel, while the blue pieces require climbing onto the rail. Place all pieces on the wheel in any order.
Do this in daylight if possible. It is one of the slowest two-player searches in the tower route.
2. Sound Check — 3400, 1230
One player sits away from six microphones and hears only the microphone being tested. Speak into each mic in order, have the seated player signal the loudest one, and remove that microphone from the sequence. Continue until every required microphone has been identified.
Counting arm raises is more reliable than shouting a long description across the room.
3. Music Room — 3200, 1260
The player in the locked booth hears one of five sounds. They recreate it over the intercom; the outside player finds the matching speaker and hangs it on the corresponding booth. Repeat for the full set.
Do not describe the sound with a private nickname only one person understands. Use a simple comparison such as “three short clicks, then a low tone.”
4. Stage Directions — 3410, 1590
The player inside the booth sees one of seven lights. The outside player uses a button panel whose positions are mirrored. Convert the inside number before calling it out: 1→3, 2→2, 3→1, 4→7, 5→6, 6→5, 7→4. Press the converted button outside.
5. Aerial Seat — 3570, 1600
Ride the crescent chair between platforms. One player reads the five-piece sequence on the far board while the other carries the matching pieces over. Backpacks make the trip faster because they let players carry more than one piece; unload bags before riding back.
The sequence is static for this puzzle, but verify the board in your own session rather than copying a screenshot.
6. Button Room alternative
Some groups use the Button Room instead of one of the nearby routes. It sits around 3290, 1670, behind the chairlift station. One player sees a light pattern in one building and describes its wall and shape; the other presses the matching button across the gap. A simple vocabulary—left wall, back wall, curve, right wall—prevents miscommunication.
Open the tunnels
Place five prizes in the Yellow Tower panel, take the key and follow the five cutters revealed by the arrows. The last cutter is beside the Yellow Tunnel. Insert the finished key into the slot on the tunnel entrance. This opens the underground network, the final radio channel route and several late-game secrets.
See all radio channels and purple puzzles after the tunnels are open.
Where to go next: collect the final radio channels, check tunnel equipment in the item guide, or move into the spoiler-marked purple puzzle tracker for complete-ending cleanup. Use the 100% checklist if you are unsure which objective remains.