Gloop rolls when I'm holding still. Pause → Settings → Recenter tilt, holding the phone the way you like to play.
I want to play lying down or on the couch. Pause → Settings → Tilt → Steering: turn the phone like a steering wheel from however you're holding it.
I can't tilt (iPad on a stand, accessibility). Pause → Settings → Tilt → Buttons: hold ◀ ▶ to tip the world.
How do I split and merge? Pinch apart to split Gloop in two; pinch together to merge.
Nearby play can't find my friend. Both phones need Wi-Fi or Bluetooth on, and Gloop needs local network access: iPhone Settings → Privacy & Security → Local Network → Gloop. One of you taps Party → Nearby → Host, the other taps Join.
Online play won't start. Online uses Game Center: sign in at iPhone Settings → Game Center.
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