Think

Critical thinking games for adults

Practise critical thinking by identifying an assumption, checking whether evidence supports a claim and considering another explanation. Keen’s Think puzzles let you answer a short everyday scenario before reading the reasoning.

By Riyad, maker of Keen at Oyrial · Updated 4 November 2026

Disclosure: we make Keen. Keen's Think section is a set of critical thinking puzzles for adults: three short, real-life reasoning puzzles a day. You answer first, then see the reasoning.

What do the puzzles practise?

• Hidden assumptions. What does this claim quietly take for granted?
• Flaws in an argument. Where does the reasoning go wrong?
• Thinking one step ahead. What happens next if you do this?
• Seeing the other side. How would someone who disagrees see it?

Each puzzle gives you a short, real-life scenario. You pick an answer, then see the reasoning behind it. The six skills above map to the six Think skills in the app. Three puzzles a day take three to five minutes.

Sample puzzles from the app

Hidden assumption. "Since our shop started playing music, sales went up. So the music made people buy more." What is the hidden assumption?

See the reasoning

It assumes nothing else changed at the same time. A new season, a sale or a busy street nearby could explain the rise just as well. Before you trust a cause, ask what else changed.

Hidden assumption. A friend says a cheap gym will make them exercise daily. What does the plan assume?

They keep going after buying the membership.

See the reasoning

The trap: paying less makes the plan feel easy to keep. But a low fee does not show that they will actually attend. Buying access and using it are different.

Spot the flaw. One late parcel arrives. A friend says this delivery firm is always late. What is the gap?

It judges all deliveries from just one late parcel.

See the reasoning

The trap: finding a cause would help explain this parcel. But one parcel still cannot establish what "always" happens. A single example does not establish a rate.

One step ahead. A team skips lunch breaks to finish more work today. What could follow later?

More errors later may undo the extra work time.

See the reasoning

The trap: the extra minutes are easy to count now. But later tiredness may bring mistakes and repeat work. A short-term gain can create a later cost.

The other side. You prefer stairs to avoid waiting. What is a strong reason to keep a lift?

Some people cannot get upstairs using the stairs.

See the reasoning

The trap: choosing a lift can look like avoiding effort. But some people face an access limit, not a preference for ease. A different limit can justify a different choice.

Weigh the evidence. You want a reliable bus. Which fact helps most?

The share of trips that arrived at the stated time.

See the reasoning

The trap: fewer late trips sound like better reliability. But routes with different trip totals need rates, not raw counts. A rate across many trips is stronger than one story.

Pre-mortem. Imagine an outdoor sale failed on a rainy day. Which missing backup mattered most?

There was no covered place ready when rain arrived.

See the reasoning

The trap: weather feels like a cause nobody can manage. But a covered backup was an inside decision the plan could make. Find a backup for the obvious risk.

How to practise without an app

• When you read a news headline, ask what else could explain the result.
• Before you agree with a claim, name one fact that would change your mind.
• After you pick a shortcut, ask what cost might show up next week.
• When a choice feels obvious, write down the best reason someone would pick the other option.
• When you see a percentage, check the raw numbers behind it.
• Before a big decision, imagine it failed and ask what you missed.

What is available free and with Premium?

• One Think session a day is free.
• Premium adds all six Think skills.
• Your Think answers stay on your phone.

Keen also trains everyday memory. See how Keen works, or our comparison of brain training apps for adults.