Four things account for almost everything people write in about. If none of them is it, the last card has an address on it.
Phones cannot find each other
Both phones need Bluetooth and Wi-Fi switched on — the direct connection uses both radios even when there is no router involved — and both need to have allowed the local network permission the first time they asked.
If somebody tapped "Don't Allow", turn it back on in the phone's Settings under PartyStack → Local Network.
Some guest, hotel and office networks block the discovery that lets phones list each other. When that happens the host's screen shows a room code and an address, and the other phones can type it in instead.
Deleting what is on this phone
Settings has three separate actions, so the drastic one is not the only repair: clear the roster, reset the records, or reset everything.
All three work on the phone in your hand, and none of them need a connection.
Deleting your account
If you signed in — which is optional and unlocks nothing — Settings → Account → Delete account removes the account and everything stored with it, permanently and immediately, from inside the app.
It does not touch the players, medals and records on your phone unless you tick the box that says so, because those belong to everyone who has played on it rather than only to you.
A game is behaving oddly
The phone is a dealer and a scorekeeper, never a judge — it cannot hear the room and it does not decide who was right. Every game says exactly what it does under "What the phone does".
If something is genuinely wrong, the version number at the bottom of Settings tells us which build you are on, and that is usually the whole diagnosis.
Quick answers
Does it work with no internet?
Yes. Everything is in the download. Signing in is the only thing that ever uses a network, and it is optional.
Is there an Android version?
The app is built from one codebase for iOS, Android and the web. The browser version is playable right now.
Can I use it with two people?
About half the library works with two, and every game states its own range rather than quietly hiding itself.
Is any of it paid?
No. No purchases, no advertising, no tracking, no analytics.