🔥 火柴棒等式Matchstick Equations
在线火柴棒等式：用火柴棒摆成的算式是错的，比如 5+2=8，只许移动一根火柴，让等式成立。可以把火柴从一个数字挪到另一个数字，也可以在同一个数字里换位置，或者把加号变成减号。共 20 题，全部由程序在浏览器里验证过一定有解，卡住时可以看提示。Matchstick Equations online: an equation made of matchsticks is wrong — say 5+2=8 — and you may move exactly one match to make it true. Move a match from one digit to another, rearrange within a digit, or turn a plus into a minus. Twenty puzzles, each checked in your browser to have a solution, with a hint when you are stuck.
先点一根火柴把它拿起来，再点一个空位（淡色的位置）放下；放下后立刻判断对错，不对会自动放回。Tap a match to pick it up, then tap an empty (faint) slot to put it down; it is checked at once and goes back if the equation is still wrong.
玩法说明与常见问题How to play & FAQ
「火柴棒等式」怎么玩？How do I play Matchstick Equations?
数字用七段式的火柴摆成（像电子表上的数字），加号由一横一竖两根火柴组成，减号只有一横，等号固定不动。每题只能移动一根火柴：从任意数字或加号上拿起一根，放到另一个空位上，使等式成立。放下后如果等式成立就过关，否则火柴自动回到原处，可以再试。Digits are built from matches like the seven-segment digits on a digital clock; a plus sign is two matches (one across, one up), a minus is one, and the equals sign never changes. Move exactly one match: pick it up from any digit or the plus sign and put it in another empty slot so the equation becomes true. If it is, the puzzle is solved; otherwise the match goes back and you can try again.
可以把火柴放到同一个数字里吗？Can I move a match within the same digit?
可以。比如把 6 中间左下的一根挪到右上，6 就变成了 9；2 挪一根也能变成 3。Yes. Moving the lower-left match of a 6 to the upper right turns it into a 9, and one move turns a 2 into a 3.
题目一定有解吗？Does every puzzle have a solution?
每一道题都是程序把所有“移动一根火柴”的可能都试过后挑出来的，至少有一种走法能让等式成立，有的题还不止一种。Every puzzle was chosen after the program tried every single-match move, so at least one works — some have more than one.
「火柴棒等式」免费吗？需要下载吗？Is Matchstick Equations free? Do I need to download anything?
完全免费，无需注册、下载或安装，打开网页就能玩，手机、平板和电脑都支持；游戏完全在你的浏览器本地运行，不会上传任何数据。It is completely free with no sign-up, download or install — just open the page on a phone, tablet or computer. The game runs entirely in your browser and nothing is uploaded.