You're about to fall for at least one of these.

12 psychological traps. No login. No typing. 90 seconds. Most people don't see it coming. Built from real, replicated psychology research — not vibes.

The Brain Trap is a free, one-page cognitive bias test. You tap through twelve short scenarios — a price anchor, a decoy pricing tier, a framed medical choice, a visual illusion, a card-selection puzzle — and each one is quietly engineered to catch you. The moment you answer, the trap springs: you see what your brain just did, the mechanism behind it in one plain sentence, and the share of people who answered exactly the same way. At the end you get a score out of twelve and a recap of every trap you walked into. Nothing is typed, nothing is stored off your device, and there is no signup. Most people fall for seven to nine.

What cognitive biases does The Brain Trap test?

Each session draws twelve traps from a pool of thirty-six, covering a broad range of documented cognitive biases and psychological phenomena:

Anchoring bias — the first number you see skews every estimate that follows.
Decoy effect — a strategically priced third option makes one of the others look like the obvious deal.
Framing effect — identical facts, opposite decisions, depending on how the choice is worded.
Availability heuristic — vivid or recent events feel far more likely than statistics say they are.
Loss aversion — the pain of losing something outweighs the pleasure of gaining the same thing.
Sunk cost fallacy — past investment, not future value, drives the decision to keep going.
Base rate fallacy — specific story details override base-rate probability in your mental calculation.
Illusory superiority — most people believe they are less biased than average. Most people are wrong.
Barnum effect — vague, flattering personality descriptions feel uncannily personal and accurate.
Müller-Lyer illusion — two lines of identical length look different because of the arrowheads at their ends.
Confirmation bias — the mind gravitates toward evidence that confirms what it already believes.
Priming effect — a word or image seen moments earlier shapes what you choose next, invisibly.

How the cognitive bias test works

Every scenario is a single tap — no sliders, no text boxes, no accounts required. After you answer, the trap springs: you see the catch, the psychological mechanism, and the normalizing statistic showing how many other people made the same choice. At the end, you receive a score out of twelve, a tier label (from "Untouchable" to "Fully caught"), and a tappable recap of every trap you encountered. You can share a branded score card or reset the traps for a fresh set of twelve drawn from the full pool of thirty-six.

Why cognitive biases matter

Cognitive biases are systematic errors in thinking that affect judgment and decision-making. They are not character flaws — they are features of a brain optimised for speed over accuracy. The anchoring bias, decoy effect, framing effect, availability heuristic, loss aversion, and sunk cost fallacy have all been replicated in peer-reviewed research across cultures and age groups. Understanding them is the first step to catching them in real decisions — financial, medical, social, and professional.