Zoysii

About the game

You are the red tile on a square board full of numbers. Swipe or press an arrow and you slide across the board, and the number you started on is subtracted from every tile along your path. A tile that reaches zero is deleted, you score its value, and your own number drops to zero too, which ends the slide. Numbers that go negative turn positive, and a tile that would land on 1 or 2 goes up instead of down, so the arithmetic keeps surprising you. The aim is to delete almost every tile with as many points as you can; delete more than two at once and you get bonus points. It sounds easy, and the rules fit on a handful of cards, but the best routes take real planning.

There are three ways to play. Quick match drops you on a random board and asks for the highest score. Levels is a campaign of hand-made boards, more than seventy of them in layers of seven, each one unlocking the next, with a limited number of moves. Multiplayer is a duel for up to four players on the same screen, with computer players if you want them, where you can also win by deleting an opponent's tile. The numbers can be shown in more than ten numeral systems, from Roman numerals to Braille, which turns a plain maths puzzle into something stranger.

Playing it here

Click Play and wait a moment for the game to load (about 14 MB, downloaded only when you press the button). The first time, the rules are shown on a few cards: press Next until the last one, then OK. Progress, settings and the ranking of your past matches are stored in this browser, so use the same browser next time; clearing the site data erases them. This edition has no links to other websites.

The game starts in your browser's language when it has a translation, and you can change it in Settings. This web edition carries only Roboto and the few Noto fonts the game ships for its numerals, and loads nothing from other sites, so Japanese and Chinese text, and the Chinese and Farsi numerals, show up as empty boxes.

Controls

Tips

Start with the Levels. They teach the rules one idea at a time, and the first layers are short.

Mind the low numbers. A tile that would drop to 1 or 2 goes up instead, so a route through small numbers can make the board harder, not easier.

Chase the big sweeps. Deleting more than two tiles in a single move pays bonus points, so a long, well-aimed slide is worth more than three short ones.

Change the numerals. If the numbers feel too familiar, switch the numeral system in Settings (or, in Levels, with the button in the bottom bar). The rules stay the same, only the look changes.

FAQ

Is there a time limit? No. You can think as long as you like.

Can I play with a friend? Yes. Multiplayer lets up to four people take turns on one screen, and you can add computer players.

Is my progress safe? It is stored in this browser. Use the same browser and do not clear the site data.

How big is the board? You choose the size and the range of numbers in Settings.

Credits and licence

Zoysii was made by DeepDaikon, with translations by many volunteers. The code and the graphics are free software under the GNU General Public License version 3, and the full source of this version, with the changes made for this site, is linked from this page. The game uses the Flutter framework; the fonts for the Braille, Linear B, Armenian, Khmer and Myanmar numerals are Noto Sans (SIL Open Font License 1.1).

This web edition updates the code to a current version of Flutter and removes every link to other websites (donation, translation, e-mail, bug tracker); the list of changes is in the licence text linked from this page, together with the notices of every library in the build.