The Core Loop: Treadmill -> Speed -> Steal -> Incubate -> Cash
Every new player starts on a personal base with the same starting Speed, and the official how-to-play text names the loop directly: steal eggs from Brainrots, hatch them into Brainrots, earn money from those Brainrots, upgrade the treadmill and base, train on the treadmill to gain Speed, and steal eggs from other players. The loop only closes if the return trip is safe, because a carried egg slows you down and a zone guardian that catches you takes the egg back. So the first session is three decisions, repeated: how much Speed to train before leaving, which nest is close enough to finish, and what to spend the first earnings on. Speed numbers, cash rates and upgrade prices are not published by the developer and are not verified on this page, so every figure here is one you read off your own screen.