Test Your Luck
A scientific prediction challenge measuring raw probability outcomes, gut instinct, and cognitive luck bias.
In psychology, "luck" is often associated with heuristics and cognitive biases. When predicting outcomes, humans often fall prey to the Gambler's Fallacy (believing that past random events affect future probabilities) or Illusory Control (believing they can influence purely random outcomes).
From a mathematical perspective, this test represents a sequence of independent Bernoulli trials where each prediction has exactly a 50% chance of success (excluding ties of 7, which are re-rolled). Getting 100% represents a rare statistical outcome (3.125% likelihood).
| 🔴 | Less (2-6) | 15 combinations out of 36 (41.67%). |
| 🟢 | High (8-12) | 15 combinations out of 36 (41.67%). |
| ⚪ | Exactly 7 | 6 combinations out of 36 (16.67%). Retakes automatically. |
| 🤝 | Net Chance | With 7s re-rolled, the active prediction win rate is exactly 50%. |
Test Your Luck Online
The Test Your Luck assessment evaluates your predictions against statistical probability. Using a standardized double dice roll simulation, users predict whether the sum will land in the "Less" range (2–6) or "High" range (8–12). The neutral middle roll of 7 (the most statistically likely outcome in a 2-die sum) is treated as a tie and re-rolled automatically. This isolates prediction accuracy to a pure 50/50 probability, evaluating cognitive biases related to random chance.
How the Test Works
- Select either the Less (2-6) or High (8-12) predictive choice.
- Click Roll Dice to spin the 3D dice.
- The dice spin for 1.0 second and reveal the sum.
- If the sum is exactly 7, a tie is triggered, and the dice will automatically re-roll.
- Correct predictions score 1 point. Repeat this for 5 rounds to get your final Luck Score percentage.
What is a Good Luck Score?
By mathematical law, the expected average score over a large number of sessions is 60% (3 wins) or 40% (2 wins). Winning all 5 rounds (100% Luck Score) occurs in only 3.125% of cases (1 in 32 attempts), which is considered "Legendary Luck". Conversely, getting 0 wins is equally rare and points to extreme bad luck.
Probability and Probability Biases
Humans are notoriously bad at assessing randomness. Common biases tested by intuition games like this include:
- Gambler's Fallacy: If you roll three "Less" results in a row, you might feel that a "High" is "due". In reality, the probability of the next roll remains exactly 50% regardless of past runs.
- Hot-Hand Fallacy: Believing that since you guessed correctly twice, your "luck" is on a streak. Independent random trials have no memory.
- Belief in Personal Luck: The cognitive attribution of random success to internal qualities (feeling "lucky" or having a gut feel) rather than purely stochastic processes.
Test Your Luck FAQ
Is this test completely random?
Yes. The outcome of each die is generated using cryptographically safe random numbers (via JavaScript Math.random) which yields flat distribution values between 1 and 6, guaranteeing an unbiased simulator.
Why is 7 re-rolled?
In a standard two-dice roll, 7 is the most probable sum, occurring in 16.67% of cases. If 7 were counted as a loss, the win rate would drop to 41.67%. Automatically re-rolling 7 ensures the decision is a perfect 50% coin flip, making the normal percentile curve clean and mathematically sound.