PR 2026 R4 - Shading & Loops

PR 2026 R4 - Shading & Loops ( 10th Apr to 16th Apr )

Links

Instructions Booklet
Puzzle Booklet ( 12 pages )
Timing / More Information
Online Solving
Discussion Thread

Online solving using Penpa is enabled in this contest. Make sure to read the F.A.Q. on online solving before starting the contest.

Supported browsers : Latest versions of Google Chrome, Microsoft Edge, Opera. At this point, we do not support Firefox.

Author

Martin Ender, Wessel Strijkstra

You may start "PR 2026 R4 - Shading & Loops" any time between 4/10/2026 12:30:01 AM IST and 4/17/2026 12:29:59 AM IST. (Server current time 4/11/2026 10:39:03 AM)

Your timer will start when you click "Start PR 2026 R4 - Shading & Loops" — then you will have 60 minutes to solve and submit your answers.

A timer will be shown the answer page with the remaining time.

If you have any questions or doubts or suggestions, please ask in the forum.

Instant Grading

Not submitted Wrong Correct

1. The rules of puzzles 10 and 11 have been modified, make sure you have the latest IB version. Also, check the forum for further clarifications.
2. There is a penpa glitch that has been around for a while in online solving mode where rules having words with a 'z' in them behave weirdly. This is just a note to prepare for that.

Link for Paper Solving

You must be logged on before you can start the contest.

In case the website goes down, send an email to logicmasteradmin@gmail.com with the answer keys. Anything within time will be considered, but only in the case of the website being down.