Compared to most of the puzzle games available on the App Store, Goishi Hiroi is fiercely unintuitive, and it had me stumped initially. It took a lot of practice to make it finally click and be able to solve the puzzle without feeling I was moving at random.
The first uncommon thing is that the path can intersect itself, like this:
The traditional Goishi Hiroi would be played by putting stones on a Go board and picking them up in sequence, so by the time you'd pass again over the same spot, the stone would no longer be there.
This means that a disc can be the endpoint of a path segment only the first time you pass over it; the following times you can only pass over it as if it wasn't there, so there needs to be another disc on the opposite side.
And many mistakes you will make. The intersections make this puzzle unintuitive, and as the grids get more complicated, the path will cross itself multiple times, making it difficult to picture it out in your head.
I believe most puzzles have a unique solution, though there are some that have multiple ones, like this one.
blog post suggests the same thing.
In a sense this makes things easier because it reduces possibilities, but it also makes things harder because you may need to take a more tortuous path in order to respect the color rule.
Initially I thought this was a new mode introduced by this game, but then I found the same kind of puzzles on the Danish website kalkulu.dk.
Most puzzles have a random layout, but some are aestethically pleasing. I liked this one shaped like a torii. I wonder if it might be a traditional Goishi Hiroi layout.
The 16 free puzzles are definitely not enough to get a full taste of the game. After playing all of them, I was still confused by the rules, and finding the solution felt like pure trial and error in some cases. Only after getting about two thirds into the Green pack, I really started to appreciate the solving process.
I haven't found a way to solve all the puzzles by only using strict logic deductions, but logic can be used to exclude many possibilities that wouldn't allow to complete the path. Solving these puzzles is a bit of an art, and there are a few recurring tricks which one should learn with some practice.
The difficulty definitely increases while progressing, and things start to get tricky in the Yellow pack, which makes all the more rewarding to find the solution.
One thing that annoys me and which I don't think fits this kind of game is that after solving a puzzle you are given a stars rating which depends exclusively on the time it took you to find the solution. So if you think your moves carefully to find the solution on the first attempt without making any mistake, you'll invariable score just 1 star, which is a bit unfair.
Want to fix that? Just tap replay and repeat the solution as fast as you can. It becomes just a game of dexterity.
At the time of writing, the Green pack is free, so definitely download this game now and unlock that pack while the offer lasts. If you are confused after the first few puzzles, don't be put off and persevere. You will get it eventually.
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