Amsterdammed

What Amsterdammed is

Amsterdammed asks you to draw one continuous closed loop that passes through every open square exactly once. The loop must not branch, fork, or end in a dead end, and it must avoid the obstacles scattered across the board — houses, windmills, and tulip fields. Every open square must touch the canal exactly twice, meaning the loop enters and leaves each square once.

How to play

To build the canal, drag between adjacent cells to lay segments, and drag back over a segment to erase it. You can also mark a border as 'cannot go' by right-clicking it, or cycle a border through canal, X, and clear with a tap. The puzzle guarantees a unique solution, so careful deduction will always lead to a single correct loop.

Tips

1. Focus on squares that have only two possible neighbors for the loop; those two must be the canal entrances.
2. Use the X marks liberally to eliminate borders that cannot be part of the loop, which makes the remaining path easier to trace.