Encouraged by Pi Han Goh. Don't blame me. :P

I make puzzles! You've seen several of them here on Brilliant.

I make games, too. 12345 in January 2014. Repel in June 2014. Rock, Paper, Scissors in August 2015. That's from earliest to latest, which also means in increasing order of quality (RPS is the best one in my opinion).

I'll put more things here if I can think of them.

I guess this can also double as a message board of anything puzzle-related to me.

## Comments

Sort by:

TopNewestOh, I had a lot of fun with rock paper scissors. The red gems weren't easy. I managed to get 2 of them! – Calvin Lin Staff · 1 year, 10 months ago

Log in to reply

– Ivan Koswara · 1 year, 10 months ago

There are 17 red gems in total (18 levels except the first one), so good luck with the rest! Which 2 red gems?Log in to reply

Nice. Getting the red gem in 5 was annoying and getting the red gem in 8 was brutal. Anyways, a few questions,

Is there a way to restart a level? Other than holding down the "Z" key?

Is there a way to choose which level you want to play? Other than starting from the beginning and skipping?

Log in to reply

Yea, I was wanting to see my score, and a level select. – Calvin Lin Staff · 1 year, 10 months ago

Log in to reply

Log in to reply

You are an awesome guy!

Here is a bunch of questions/comments for you:

gamesare puzzles too.The Art of Game Design: A book of lenses?Log in to reply

My games are puzzle games; in fact, I'd be fine with them called "interactive puzzles". After all, Sokoban is essentially an interactive puzzle too, no?

I don't think I've ever posted puzzles under Computer Science. However, some problems have inspirations based on puzzles (the "count the number of Fillomino grids" and "count the number of loops" sets, at the time of writing). Since they are posted in Computer Science, you're allowed to write programs. In fact, except for the easiest version of each set, I did need to program it. (I also programmed the easiest version, just to check that my program works correctly for an easy case, so I don't have to spend much time running for the other versions just to find that my answer is wrong.)

I haven't.

I assume you're talking about deductive pencil puzzles (like Sudoku and Fillomino), since those are my forte. (If you're talking about puzzlehunt-style puzzles such as MIT Mystery Hunt, I can't do them well either.) Puzzles are pretty similar to math problems. Sometimes, it's just a sequence of small steps, with perhaps a little "aha!" moment here and there. (Both my Fillomino puzzles here are pretty much that, small steps strung together.) Small steps are easy to learn; just practice puzzles to learn the tricks. (For example, in Slitherlink you sometimes notice two 3s that are adjacent, either orthogonally or diagonally; both of them are small-step patterns that you can notice as you do more puzzles involving them.) Sometimes, it's a giant step, requiring global-scale logic: seeing the whole board at once, instead of fixing attention to just a small piece. This part is difficult to train precisely because there's no exact way to tackle them; such puzzles involving large steps are unique because of that reason. If you're stuck, try looking at any possible small-step logic; if there's none, it means you'll need a large-step logic, so zoom out from the puzzle and take a look across the grid. At the worst case, just try bifurcating, trying every possibility. (Even bifurcating has its own technique to avoid too much branching.)

Yes, somewhat.

I don't know what I just typed. – Ivan Koswara · 1 year, 10 months ago

Log in to reply

– Agnishom Chattopadhyay · 1 year, 10 months ago

Apologies. I edited the comment, can you check it?Log in to reply

– Ivan Koswara · 1 year, 10 months ago

There we go.Log in to reply

– Agnishom Chattopadhyay · 1 year, 10 months ago

Thanks!Log in to reply

I really enjoyed playing this game... I was stuck well it doesn't say the level onscreen but I've got three different coloured blocks and 5 "warps" in a cross. And I'm not sure where to go with it.

Great game!!! – Peter Michael · 1 year, 7 months ago

Log in to reply

Same – Jade Biado · 1 year, 8 months ago

Log in to reply

Hey if you like puzzles, can you give me feedback on a problem solving book I am developing? Sample puzzles (that are explained as a series of problems) are here: http://www.problemsolvingpathway.com/pspsamples/PuzzledProblemSolving.pdf http://www.problemsolvingpathway.com/pspsamples/sudoku.pdf

Feedback from anyone is welcome. Thanks – Ashley Fernandes · 1 year, 10 months ago

Log in to reply

The second link: The first thing I notice, strangely, is the fact that 9x9 and 3x3 appear in Times New Roman instead of LaTeX. Also, you probably don't need to say that all Sudoku puzzles with less than 17 givens has not unique solutions (either many or none); you may give it as a trivia, but it's otherwise not particularly relevant. But I suppose it's nitpicking, so let's get to the contents. It's essentially a walkthrough of a few Sudoku puzzles, stating applying this strategy here and there. I'm not sure that your claim of the book not teaching you Sudoku techniques to be valid, although you can also reply "it's basically 'look for some trick you know, if you can apply it somewhere', applicable to all problems" which I can't refute either. I don't think I have any further comments for this. – Ivan Koswara · 1 year, 10 months ago

Log in to reply

– Ashley Fernandes · 1 year, 10 months ago

Thanks, comments and feedback appreciated!Log in to reply

How do you do that – Tushar Kaushik · 1 year, 10 months ago

Log in to reply

Awesome – Pranjal Prashant · 1 year, 10 months ago

Log in to reply

This is fab dude! – Priyansh Sangule · 1 year, 10 months ago

Log in to reply

@Ivan Koswara Man, I salute you. This is fantastic! You're absolutely great. – Mehul Arora · 1 year, 10 months ago

Log in to reply