Case 16: Murder Sudoku

Help & contact

Stuck on a case, or something is not working? Start below. If the answer is not here, write to apps@blankhexadecimal.com and a person will reply.

How do I solve a case?

Every suspect stands on exactly one square, and no two share a row or a column. “Beside” means left, right, above or below, never diagonal and never through a wall. Nobody stands on a table, a plant, a shrub or a box, and no clue will tell you that; read it off the floor plan. The victim was alone with the murderer, so the victim’s room holds exactly two people, and the other one did it. The How to play row in the Detective tab walks through all four rules.

I am stuck. Is there a hint?

Yes. A hint reveals the next step of the intended deduction, not the answer. It plays a short ad first; if none loads, you get the hint anyway. Time spent watching the ad does not count on your clock.

How do I remove ads?

Every case is free. A subscription at $1.99 a month, or a single $9.99 payment, turns every ad off. Both are in the Remove Ads panel at the bottom of the Detective tab, and both are handled by Apple, so you cancel the subscription in your Apple Account settings under Subscriptions.

I paid but I still see ads

Open the Remove Ads panel and tap Restore purchases. Your purchase follows a random identifier kept in the iOS keychain, so it survives reinstalling the app. If Restore does not bring it back, write to us with the email address on your Apple receipt.

Where did my progress go?

Closed cases and saved boards live on your device, so an update keeps them. Deleting the app deletes them with it, and so does erasing or resetting the device. Only the random identifier your purchase follows is kept in the keychain, which is why a reinstall keeps your subscription but not your progress. There is no account, so progress does not move between phones.

I think a case has a mistake

Every case is checked by a solver to have exactly one answer before it is published, but a clue can still read badly. Write to us with the case number and title. It helps to tell us where you were stuck.

Delete my data

Tap Delete my data in the app’s Detective tab. It erases your closed cases, times and monthly ranking entry from our server and from your phone at once; it does not cancel a subscription. If you cannot, write to apps@blankhexadecimal.com from the Help & contact row in the same tab, which fills in your device identifier, the one thing we need to find your record. The privacy policy has the rest.