Railjoin

Railjoin is a train tracks logic puzzle. Using the numbers beside the board as clues, join the entrance A on the left edge to the exit B on the bottom edge with one unbroken line of track. The numbers along the top and right edges say how many cells in each column and row hold track. A few cells come with track already laid. The line never branches, crosses itself or closes into a loop, and it never connects diagonally. Each board has only one answer, and deduction leads you to it step by step, so luck never decides anything. Before a board went into the app, a solver program worked it through from start to finish. This railway puzzle has no lives and no time limit either.

Key Features

How it plays Drag from cell to cell to lay track, and drag back over it to take it up. Tap an empty cell to cycle through × (no track here), ● (track passes through, direction not known yet) and back to empty. The board is solved when the track runs from A to B and every number matches; you don't have to place every × and ●. Undo as often as you like, and a whole drag counts as a single step.
Hints that explain why Can't see the next move? Tap Hint, and the part of the board to look at is highlighted together with the name of the technique that applies, such as Line full or Crossing parity. Tap Show more for the move itself and its reason, and Apply puts it on the board. Wrongly placed track, × or ● is flagged first. Hints never rest on your own × and ● marks, so a stray one can't mislead them. There is no limit on hints.
A train at the finish Once A and B are joined, a small train runs along your own track before the result appears. Cells glow as you lay track, and the sounds are steel and wood. Glow when joining, Train on completion, Sound effects and Vibration each have a switch, and Reduce effects tones the effects down in one go.
Records For each level, boards solved, boards finished without hints, and average and fastest times; for Daily, your current and longest streaks plus days and boards solved. Only boards finished without hints count toward a fastest time.
Easy to see, easy to draw Boards with small cells (12×12, or 10×10 on a narrower phone) open zoomed in. Pinch to zoom out, touch and release a spot to zoom back in there, and the board scrolls along when you drag near the screen edge. The screen is light by default and follows your device's dark mode.
Assistance Rule conflicts show up the moment they happen: a row or column over its number, a branch, a closed loop. Show mistakes instantly flags wrong track, × and ● at once, and turning off Show timer hides the clock.
A seven-step tutorial A short guided 6×6 board covers the basics in seven steps, from laying track to using hints. Skip it any time, or replay it from Settings.
Offline play No account, no login, and your records stay on your device. Everything works offline, Daily included.
Multilingual English, Korean, Japanese and Chinese (Simplified and Traditional), following your device language or your choice in Settings.
Free to play The only ad is one slim banner under the play area. There are no full-screen ads, no rewarded ads and nothing to buy.

Railjoin

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Two Ways to Play

Key Features

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