look around; swipe to turn a corner, drag slowly to aim
tap
anywhere, walls included: walk that way, as far as you can see
tap low
one step back
hold
on the thread to walk it, low down to walk it backwards.
At a fork, aim to one side to choose — keep holding and you can change your mind.
On a keyboard, hold shift, with ↑↓ for which way along it and ←→ to steer.
double tap
split the screen and see the thread behind you; this half keeps working, so you can walk on with the map open
Labyrinth
Collect everything the maze is hiding, then follow your own thread back to where you started.
seed —
out
You found everything and came back by your own thread.