The Tallest Mountain is the tallest point in CP3D, as well as a party room. It was accessible via the Hot Air Balloon during the Festival of Flight.
- Clicking the computer next to the balloon would result in turning it on.
- Throwing a snowball at a target attached to a generator would generate yellow electricity, which would then transform into blue electricity for a short duration of time before dissipating.
- A poster referencing staff members Tomastos1 and Wydrop as the first penguins to scale the Tallest Mountain was hidden behind a cluster of barrels.