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.

Puzzle 100 – Tapa

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


If you are confused, start from puzzle 99.

Once you are done, congratulations! Great job!

I wanted to do something cool for my 100th puzzle, and I’m very happy with how this worked out. (I was thinking of doing a “jigsaw” puzzle to create the hitori, but decided against it.) Even so, I am very surprised with how many puzzles I could put into the one grid without adding new information each time. I probably take a break from constructing for a bit and leave this puzzle up for a while, so people will see it. If you enjoyed it, tell other puzzle-lovers about it and/or leave a comment. 😀

Puzzle 99 – Hitori

This is a hitori puzzle. Don’t shade in the shaded cells too darkly, and when you finish, don’t throw out or delete your solution, and then proceed to puzzle 102.

EDIT: To clarify, this puzzle, and all the others, are uniquely solvable on their own (I hope). You don’t need to know anything about any of the other puzzles to solve any puzzle.