u/According_Mine229

Method:

1. Use an alt and make a squad for Sandbox.

2. On your main, enter in the main Clans page and use the alt to invite your main into Squad.

3. Click the Clan War and Accept Squad Invite buttons at the same time.

4. Use your alt to start the game (do not ready up on your main)

5. On your main, you should be able to enter Training Grounds while in the Squad.

Literally the first 34 clans are all hackers. Guess Cubic gave up on PG3D after PG2.

There's a fifth guy in the hall connecting to this room.