Bori: Mystery Brain Training

Read 20 illustrated detective stories, compare witness statements and connect the evidence. Practice five puzzle types and review your training results.

Twenty detective cases, each with a short story and five types of puzzle.

A pocket watch goes missing at 221B. A cat disappears from a tea party. A concert hall loses its sound. Read the story, compare the clues and decide what the evidence supports.

FIVE TYPES OF PUZZLE • Spot the Change — compare two statements and find all the altered details. • Find the Missing Piece — identify information that the statement leaves out. • Connect the Evidence — match each claim to supporting evidence. • Remove the Noise — keep useful clues and remove unrelated sentences. • Verify First — choose what to check before accepting a claim.

CHOOSE YOUR CASE Each of the 20 cases has its own story, cover illustration and difficulty level. Choose a challenge without replaying easier cases to unlock it. Replays draw from a pool of problems for that case.

Five cases are fully free, including their stories and all five puzzle types. The leaderboard and research page are also free. Full access opens the other 15 cases, including the hardest challenges, and your training analysis.

REVIEW YOUR PRACTICE See your accuracy by weekday, time of day and puzzle type. The research page explains the ideas behind the exercises and links to the references.

Bori is for education and practice. It does not measure IQ, brain age or dementia risk, and does not diagnose or treat a condition.

DATA AND LANGUAGES No account or email is required. Progress is saved on your iPhone. The online leaderboard receives a random installation identifier, case number and score; the server derives country from the connection. Usage analytics, such as screen visits and time spent, are sent to Pentarab's own collector with a random installation identifier.

Stories, puzzles and controls are available in English, Korean, Japanese and Simplified Chinese.

FULL ACCESS SUBSCRIPTION • Length: weekly or yearly, automatically renewed each period • Price: see in-app pricing for your region • Payment is charged to your Apple Account at confirmation of purchase • Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period • Subscriptions may be managed and auto-renewal turned off in your Account Settings on the App Store

Terms of Use (EULA): https://www.pentarab.com/bori/terms Privacy Policy: https://www.pentarab.com/bori/privacy