The better chance
More good tokens does not always mean better odds.
Try this taskKea Challenge
More gold—or a better chance?
Compare proportions, barriers and selection rules.
What you will do
The kea challenge turns jars of gold and blue tokens into probability decisions. A jar with more gold tokens can still offer a worse chance if it contains many more blue tokens. Compare the gold share of the eligible set.
Barriers change which tokens can be drawn. Selection rules change how a person draws them. In the barrier task, lower the screens and compare only tokens above the barriers. In the person-selection task, inspect whether each draw is random, deliberate or a stated mixture.
Games you can play
The barrier matters
Only reachable tokens can be drawn.
Try this taskWho draws the token?
Watch the selection rule, not just the jar.
Try this taskHow the animal challenge works
Three tests with five rounds each. You have one life: every round must be correct. Tests become harder automatically, from Light through Medium to Demanding. Before each test, take your time with the rules and example. Choose relaxed or sport tempo; the clock starts when you start the task.
What to watch for
- Use gold divided by all eligible tokens, rather than the gold count alone.
- Check accessibility and drawing rules before comparing the jars.
Before you play
Where should I start?
Open one task and read its goal and example before starting. Training lets you choose the task profile and tempo.
How many rounds are there?
Each task has five rounds. Training allows one wrong round; one-life challenges require all five to be correct.
Are my results saved?
Progress and records stay locally in this browser. There is no player account. Clearing this website’s browser data also removes the stored progress.
The idea behind the games
These are original game tasks, partly inspired by animal cognition research. The research notes link to the original papers and explain how our game ideas relate to them. Read the research notes.