P.I.HUNT 5 in a month!

So here’s a puzzle that’s pi and 5 themed! ūüėÄ

Decompose the pi shaped grid into the twelve pentominos, allowing both rotation and reflection.


Puzzle 150 – Liquid Measurement

I turn 21 today!

If you haven’t seen before, I post an age-themed puzzle each year (Here’s last years). 21 is drinking age (in US), so I have a drinking related puzzle for you.

Normally in these sorts of puzzles, you have an unlimited amount of liquid, and 2 or 3 cups, but like all college students, I’m too frugal to give you all that! In this puzzle, there’s only 1 cup.

The cup is a cube, measuring 10 units in width, length, and height, and which also has a vertical dividing wall that goes halfway up cutting it in half. I’ve attached a diagram to make it more clear, along with a front and top view.

You are given the cup and a straw, and the cup begins filled to the brim with beer. Besides the beer that comes in the cup, you aren’t given any extra (or any source to keep beer you’ve poured out.) Your goal is to drink exactly 21 cubed units of beer.


It’s the day right before the Ides of March, which you might also call Pre-Ides day, or P.I. day for short! In fact, according to Google, it’s the 30th anniversary of Pi Day, so a special one indeed.

This year’s P.I. HUNT is themed around Gravity Falls, though you don’t need to have any Gravity Falls-specific knowledge in order to solve it. In fact, you don’t need any¬†outside knowledge to solve it! That means both that you don’t need a computer to solve it, so it has no trivia, no codes like braille, morse, semaphore, etc., and also that¬†it’s intended to be solved completely without a computer (except maybe looking up words you don’t know, or the like). See more info about printing below.

(Note that you can solve if you haven’t watched Gravity Falls, or have watched it, but if you’ve started watching and intend to finish, there are spoilers past this point. Also, the show finished airing more than two years ago! What are you doing? Go finish it!)

In the show, it was believed that Stanford Pines had written 3 journals about his findings in Gravity Falls. However, it was recently discovered that there was some more pages that had been unaccounted for, meaning the actual number of journals was a number slightly larger than 3…

It is VERY HIGHLY RECOMMENDED¬†that you print the journal out. You should print it double sided, and as you go through it, flip pages from your right to your left, as if you were reading a book. I also recommend using a pencil, through if you write on the pages with pen, (or ruin them for any other reason…)¬†the good thing about it being a pdf is that you can just reprint those pages.

Because lots of printers are weird and different, the printing might be the most daunting puzzle. I’ve provided a test page below. You can print the test page to make sure the printing will work okay before printing the journal. You don’t need color printing, and also there is a margin worked into the document so you don’t need edge-to-edge printing. When you print the test page double sided, the dot should be exactly in the center, and the asterisks should line up when you hold it to the light (if they are off by a little, that’s okay). The arrows shouldn’t be cut off, and should be as close to the edge of the page as they appear in the pdf (a quarter inch). Sometimes the printer tries to add an extra margin, so if there’s an option to set margins to 0, or set the scale to 100%, or an “Exact Size” option, you should select that. I had some troubles when opening the pdf in Chrome and printing it from there, so you should try saving it to your computer, and printing it using that menu. If you’re having trouble with the margins (printers are weeeeird!) you can email me and I can try to help.

You can email me (at jack[dot]l[dot]lance[at]gmail[dot]com) if you have found an error, are stuck and want hints, or have any other comments, but because there’s no unlocking this year, you don’t need to email for anything besides the final answer.

Test Page (not a puzzle)


~ 22/7 – 7/100

It’s just a week until P.I.HUNT, so I thought I’d write a little more so if you’re looking at it early on Pi Day, this’ll be the first thing you see. I’m going to post it on 3/14 1:59 PM EST. This year, you’ll get all the puzzles at once, and don’t have to send me answers to unlock anything. Also, it’s more intended to be solved individually, but you can solve as teams if you want (though I recommend solving with people you are physically¬†with if so.) Lastly, if the timing isn’t convenient, it’s fine. Like always, it will stay up even after Pi Day.

Puzzle 148 – Matchstick Puzzle

I’m 20 today!

There are 20 matchsticks arranged in the shape of the word TWENTY below. Your goal is to move just 4 matchsticks to make an expression which, when evaluated, equals 20.


Like every year, it’s hard to guarantee uniqueness. I think it likely is unique, but even if it’s not I’d be interested to see what creative solutions you can come up with. ¬†If you want to check your answer against mine, the MD5 hash of the expression I have, with no spaces, is¬†f7195be5dde9a77f21175cd8049ed557

Puzzle 103 – Dissection

Do you remember that post I made exactly one year ago? If not, you should probably check it out first. Well, I turn 18 today.

Use 6 line segments to divide the following into some amount of pieces so that¬†it is possible¬†rearrange those pieces into a 3×6 rectangle. You may not reflect the pieces, but you can rotate them. There are three images below, but they all show the same puzzle. The first plainly shows the “18”, the second has grid-lines drawn in (so you can see exactly what the shape is), and the third is blown up (for convenience). The shapes are made up of straight lines and quarter arcs with radius 1/2 of a unit.


With dissection puzzles, it is hard to solve logically, so I think my solution is unique, but I can’t be too sure. If you give up, or want to check your answer against mine, click the following link: SPOILER WARNING. DO NOT CLICK IF YOU DO NOT WANT TO SEE THE ANSWER YET.

Puzzle 102 – Fillomino

This is a fillomino puzzle. Except, well… where is the puzzle?


If you are confused, start from puzzle 99.

Once you are done, go to puzzle 98.

EDIT: Sigh… Making non-broken puzzles is hard. Because of the large constraints on this puzzle, there is a teensy ambiguity in this puzzle that leads to 2 solutions that I cannot fix no matter what I do. Choose the solution which makes puzzle 98 possible.