No. Currently, the game does not have an active code system. Avoid clickbait sites claiming otherwise. Check our Codes Page for real-time updates.
You need to run past the 600m mark. The Secret Area is a hidden zone at the very end of the track. You need at least 140 Speed to reach it safely before the tsunami hits.
There is no hard cap, but upgrades become incredibly expensive after 200 Speed. Most end-game players sit around 180-220 Speed.
It's pure luck (RNG). A Diamond mutation has roughly a 0.1% chance to spawn on any Brainrot. There is no way to force it, just keep farming.
No! Rebirth ONLY resets your Speed and upgrades. You keep all your collected Brainrots and base slots. This is why you should stock up on good Brainrots before rebirthing.
Only if you buy a private server (VIP Server). In public servers, PvP is always enabled in certain zones, allowing players to steal from you.