#sudoku

art I did for a naughty sudoku game

profits go to charity:

Before I say anything else, I am going to be talking about a game that is VERY new and has pretty terrible search optimization, so in case this blog post somehow came up near the top of results for someone, here is the as-of-this-writing-current 1.02 release, and for good measure, here is the official FAQ page with the full version history, any future patches, and an FAQ for some of the more confusingly worded stuff that crops up later into the game. Now on with the praise-heaping!

So... Sudokuvania pretty much exactly what the name implies. It's a -vania, that is, a Metroidvania, and specifically one styled after one of the ones that's actually in the latter Castlevania series so that naming convention actually makes sense. Exploring a big castle, fighting bosses, getting various items letting you explore more areas, maybe breaking out of the borders of the map to find cool secrets here and there.

Also, it's a variant of sudoku. And I don't mean someone sat down with some videogame designing toolkit and made a videogame where some of the gameplay is solving logic puzzles on a grid you fill with numbers (I mean, I guess technically I do). I mean that link to the game I posted takes you to a website with a little built in standard app for solving sudoku puzzles and weird variations thereof, and the particular puzzle it's pointing to, somehow, manages to have a big map to explore, boss fights, special items that give you new powers, NPCs, and for good measure, fog of war. It is, again, an absolutely amazing hacky thing and I'm flabbergasted at how well executed it is. Now you're probably wondering how that even works, and that's why I'm writing this big gushy blog post. Here's what you see when you first load it up:

You're going to notice there is some absurdly small and kind of important text you can't possibly read, and that's because again, this is kind of a hacky thing this site so was not designed for. So it's kind of annoying but if you access this through the proper introduction page, it'll explain that the first thing you need to do is click the little gear icon in the floating tool palette, toggle on Visuals: Draw arrows above lines and Disable emoji replacement, then scroll all the way down to Experimental and turn on Test Large Puzzle UI. That enables you to zoom in and out with the scroll wheel, and right-click drag to pan around. It's... a little clunky because again, this website was NOT built for this, but tada, now you can zoom in, read the text, and start solving at a reasonable size. Then there's a couple gameplay concepts it does its best to explain, but... most people I've shown it to myself included needed extra explanation of a couple important early concepts. So let me just do a little color coding here to make this easier to get...

The map is not, in fact, one great big grid. It's 9 squares (and one rectangle that's not quite square over on the east side). Each of these is its own 9x9 Sudoku grid (well, the starting one is 6x6 and has those mutant 2x3 cells instead of the usual 3x3, and there's that weird eastern mutant). If you're solving stuff in one square, you completely ignore everything outside that square, except for where they overlap, in which case the numbers you're placing have to fit for both puzzles. So if we look at the light grey/green intersection on the left, those three overlap cells respectively can't be 4 6 or 5 (and whatever use you deduce in the grey box, but the pure green cells completely ignore all that, you're just focusing on the green 9x9 (which is going to have the overlap as a starting point, naturally).

The next bit that through me off a ton is the way fog of war works. Let me reasonably zoom in and do a little solving here. One second...

Here's the whole starting area all marked up to hell like you do when you're kinda bad at Sudoku and don't know how to spot a starting point. Penciling in little numbers in the corners. You'll also notice a that... most of the map is covered in this dark grey fog of war. A lot of in-game stuff mentions that you shouldn't go clicking out into the fog of war, because it'll show you names of later areas and preview certain special rules and all, but that's talking about clicking WAY off from what you can see. You are 100% allowed to solve stuff out in the fog of war, and it's pretty stingy about de-fogging. Don't go blindly guessing because then you can maybe end up sequence breaking but... yeah. Sorry I'm spoiling the Front Gate, it's basically the tutorial though. Anyway, first move is obvious, only one place we can put that 6, and suddenly...

Tada, important space so it rewarded us with a little fog clearing. You can also see that this will handily point out stuff in your pencil notes that can't be true, but only if A- it's untrue for standard sudoku reasons not special stuff, and B- it's not in the fog of war (or on the other side of some. You also maybe noticed that weird green thing under that first hint 6? That's something we need a tool for, you don't worry about it until you have that tool. Solving this out some more...

Little more de-fogging, both of the puzzle area and the margins where we're getting new information on playing the game in general. Now right here if you're observant, you'll see that bottom right corner has to be a 6. It's out in the fog of war, but you can mark it if you know what it is. And...

I was cropping it out before but the big purple number pad is always floating off to the side there, and the green text box over it, which among other things has an area name and flavor text for whatever grid you're in. This won't ALWAYS happen when you place numbers in fog of war, but there was a trigger on this 6 to load in a little piece of the first real area, and oh hey, we unlocked "Guide THERMO!" That's our first tool, and it's described up in the upper left.

So tada, from here out in addition to standard sudoku stuff, you've got these "bronze Guide THERMOs" that show up here and there and have this extra rule. You basically never get free numbers in the grid past the Front Gate, it's all slow-marching into new areas using what you're bringing in plus some easy starting examples of how your new tools work, plowing on from there. The fog of war is pretty stingy but it keeps you focused. You'll also notice the rules here mention bosses, all the 9x9 ones have one. It's clearly marked, and you should PROBABLY expose it from the fog first, but any time you're in the area really you, if you scroll around in that green text box or hit the rules button when in a grid, there's a link you can click to go fight it. The boss fights are all separate puzzles (site's good about auto-saving so don't freak out if it takes over your tab and you have to hit back after). These are very themey, sometimes VERY evil (especially boss #1, feels a bit overtuned) self-contained 9x9 puzzles, probably using the same tools their area is themed around, and I don't think there's a single pre-placed number in any of them. Beat the boss puzzle, it gives you some flavor text and a number to place in its cell back in the main castle puzzle, plug that in and you're always going to unlock something cool. Usually a new item, sometimes other weird stuff, and it just goes on like that.

Don't expect to be able to fully solve a given grid in one go. It's a Metroidvania, backtracking is expected. Even if you've fully de-fogged a grid, later stuff might reward you by straight up adding new symbols you couldn't see before or doing weird stuff with fog. It IS all solvable with pure logic... but there ARE a few places that do that thing I hate in tougher sudokus where you just kinda have to pencil in in a different faction and explore 2 possible futures for a bit to see which eventually contradicts itself. And of course the last couple of grids do some really evil mind-bendy stuff.

But yeah aside from a couple gripes where the way a tool works could maybe be a lot more grammatically clear, that first boss being a lot to deal with as you're first getting your feet wet, and a particularly cruel twist later on, I don't really have any complaints. Well, it might need a cool soundtrack. Maybe play some Castlevania music. Maybe switch it up for some real proper boss music when you're nearing victory.