Phones join with the 4 letters on the TV (or the QR code). The left half of your phone moves your cursor on the TV. The right half is seven jobs, each with how many you've got left. A job goes to your wiggler under your cursor. If none of yours is there, it's a flag on the floor, and the next one of yours that walks over it takes the job, once it's any use: a chew flag waits for flesh in front, a bridge flag for a gap.
They just go: along the floor, up and down little steps, turning around at walls, off ledges. Fall too far and they splat. Walk into acid and they're gone. They don't think. That's your job.
BLOCK: everybody (anybody's) turns around at it. CHEW: through soft flesh, straight ahead. BORE: straight down. BRIDGE: twelve blobs of goo, straight across. BUBBLE: floats down any drop, for good. SPRINT: twice as fast. DECOY: the white cells come for it instead.
White blood cells eat whoever they catch. Acid. Mucus floods (everything in it is slow). Tunnels cave in (you hear them creak first). Dead ends.
Partway through, the door at the end opens. THE EGG: only one gets in; the first one to reach it wins 250. THE EXIT, THE TONSILS, THE TISSUE: doomed, so it's about getting the most of yours there anyway (10 each, 50 for the most). The last round is always the egg.
Five rounds (or three). The most points: the most motile. A mouse and the 1-7 keys can play; so can the arrows and Z-M. Esc pauses. If everybody left is stuck, the VIP's phone (or the pause menu) ends the round.