Four Alike (Square Variant) · 大同棋（方块版）
Four Alike with one more way to lose: any 2×2 block sharing a trait also wins, so the middle of the board is never quiet.
多一种输法：任意 2×2 的四颗有共同点也算赢，于是棋盘中央再没有安全地带。
在大同棋基础上，2×2 方块里 4 颗棋有共同点也算赢
Same as Four Alike, but a shared 2×2 block also wins
玩法要点
- 棋子：共 16 颗，互不相同
- 棋盘：4×4，共 16 格
- 获胜：一条直线或任意 2×2 方块，4 颗棋有共同特点
Quick start
- If any row, column, or diagonal ends up with four pieces that all share one trait (all dark, all hollow, whatever it is), whoever just placed that piece wins.
- On your turn, you place whichever piece your opponent handed you last turn — you choose where on the board it goes.
- Any 2×2 block of four adjacent cells on the board also counts if its four pieces share a trait — it doesn’t have to be a straight line.
快速上手
- 横、竖、斜任意一条直线上的 4 颗棋，只要有一种特点是一样的（比如都是黑的，或者都是空心的），摆下最后一颗的这一方就赢了。
- 每一步棋，摆的都是对方上一步选好、交过来的那一颗，摆在哪个空格自己决定。
- 棋盘上任意一个 2×2 的小方块（4 格连在一起，围成正方形），只要这 4 颗棋有一种共同特点，也算赢——不一定要连成一条直线。
Rules
16 Pieces, All Different
Every piece has 4 traits — big or small, dark or light, square or round, solid or hollow — and all 16 combinations exist exactly once.
No piece belongs to either player; either side can place any of them.
Your Opponent Picks, You Place
On your turn, you place whichever piece your opponent handed you last turn — you choose where on the board it goes.
Once it’s placed, you pick a piece and hand it to your opponent for their turn.
The very first move of the game is different: the board is still empty, so there’s nothing to place yet — just pick a piece and hand it over.
Four Sharing a Trait in a Line Wins
If any row, column, or diagonal ends up with four pieces that all share one trait (all dark, all hollow, whatever it is), whoever just placed that piece wins.
Even if your opponent handed you that exact piece — placing it is what counts.
A Second Way to Win: 2×2 Blocks
Any 2×2 block of four adjacent cells on the board also counts if its four pieces share a trait — it doesn’t have to be a straight line.
There are 9 such blocks on the board, so watch both shapes while you play.
A Full Board With No Win Is a Draw
If all 16 squares fill up and neither a line nor a 2×2 block ever shares a trait, the game ends in a draw.
Timer
Each turn lasts 60 seconds. When time runs out, the turn passes to the other side automatically.
You can change the difficulty anytime in Game Settings.
规则详解
16 颗棋子，各不相同
每颗棋子有 4 种特点：大小、黑白、方圆、空心还是实心，16 种组合各只出现一次。
棋子不属于任何一方，谁都能摆到棋盘上。
摆的棋，由对方指定
每一步棋，摆的都是对方上一步选好、交过来的那一颗，摆在哪个空格自己决定。
摆完之后，再选一颗棋交给对方，轮到对方摆下一手。
开局第一步比较特殊：棋盘还是空的，没有棋可摆，只需要选一颗棋交给对方，由对方摆下第一颗。
直线连成 4 颗有共同点就赢
横、竖、斜任意一条直线上的 4 颗棋，只要有一种特点是一样的（比如都是黑的，或者都是空心的），摆下最后一颗的这一方就赢了。
即使这颗棋是对方选来的，谁把它摆上去，谁就赢——这正是这盘棋最特别的地方。
多一种赢法：2×2 的小方块
棋盘上任意一个 2×2 的小方块（4 格连在一起，围成正方形），只要这 4 颗棋有一种共同特点，也算赢——不一定要连成一条直线。
棋盘上一共有 9 个这样的小方块位置，摆棋的时候两种赢法都要留意。
摆满还没赢就是平局
16 个格子全部摆满，如果直线和 2×2 方块都始终没有凑出共同特点，游戏就算平局。
计时
每步限时 60 秒，时间到了会自动换对方走。
可以在"对局设置"里换一个难度，随时都能换。