Bluffline
Baseline’s bluff-your-friends party game
Bluffline is the multiplayer party game built into the Baseline app — pass-and-play on a single phone, no setup or accounts required. One player is secretly told to tell the truth or to bluff, records a short answer, and everyone else votes: real or fake? You’re playing against the table and against Baseline’s own read — which you can beat.
How to play
Pass the phone
Add everyone at the table by name. Each round the phone goes to one player — the answerer — while everyone else looks away.
A secret coin flip
The app privately tells the answerer to either tell the TRUTH or to BLUFF, then gives them a prompt (60+ to draw from, or write your own).
Record a short answer
The answerer records a ~30-second answer to camera — telling it straight, or making it up convincingly. Nobody else has seen the secret assignment.
Everyone votes
The phone passes around and each other player votes: real, or fake? Meanwhile Baseline analyzes the answer on-device and forms its own read.
The reveal
Truth or bluff is revealed — along with who guessed right, whether the AI was fooled, and what an old-school “lie-detector” rule would have said. Points are tallied and the phone rotates.
How you score points
| Play | Points | When |
|---|---|---|
| Guess right | +1 | You correctly call the answerer’s truth or bluff. |
| Beat the AI | +1 | Bonus on top of a correct guess when Baseline got it wrong (or was inconclusive). The AI is a worthy opponent — beating it is the whole point. |
| Fool the table | +2 | You were told to bluff and the table did NOT catch you (the majority failed to vote “fake”). |
Points accumulate across rounds; the phone rotates so everyone gets a turn as the answerer. A running leaderboard tracks wins and points by player.
Baseline’s read — and how to beat it
After each answer, Baseline scores it on-device — vocal, facial, and language signals — and collapses that into a playful truth / bluff / inconclusive read. It’s a genuinely tough opponent: it even folds in an AI plausibility check, so a logically impossible story tends to get caught. But it is beatable — a flat, calm liar or a nervous truth-teller can flip it, and every time you out-read the AI you score.
For contrast, the reveal also shows what a debunked folk “lie-detector” rule would have guessed — shown deliberately as an unreliable example of the pop-science Baseline rejects, not endorses.
Bluffline is a game, not a verdict. The AI’s read is a deviation signal for entertainment — it is wrong on purpose sometimes, and that’s the fun. It says nothing about whether anyone is honest in real life. No method reliably detects deception, and we don’t pretend otherwise — see the methodology and honest accuracy disclosure.
60+ prompts, or write your own
The deck spans personal confessions, brags, fears, travel, relationships, and opinions — the kind of prompts that make a great story whether it’s true or invented. Before each turn you can shuffle, filter by category, or type a custom prompt for the table.
Bluffline is included free in the Baseline app — it’s the second tab, right next to your personal reads. Recording and analysis happen entirely on the device; only game outcomes (never recordings) are saved.