Dino Trail

About Dino Trail

Dino Trail is a one-line puzzle. A grid of squares holds a few numbered nests. Starting on nest 1, draw a single trail with your finger or mouse that passes through every square exactly once — up, down, left or right, never diagonally, never crossing itself — and reaches the nests in order, ending on the highest number.

It sounds simple, and the first steps are. The trick is not to paint yourself into a corner: a square left behind can never be reached again. Every grid has at least one way through, and any trail that keeps the rules counts. A round is three grids, five, six and seven squares across; your time for all three, measured by our server, goes on the weekly leaderboard, which resets every Monday at 00:00 UTC.

How to play

1. Press Start. The first grid appears with its numbered nests, and the clock starts.
2. Put your finger (or mouse) on nest 1 and draw: the trail follows you from square to square.
3. Go back over your own trail to undo it, or tap any square of it to cut the trail back to there.
4. Pass every square exactly once and reach the nests in order. The trail must end on the last nest.
5. Finish a grid and the next, bigger one appears. Complete all three to finish.
6. Sign in to put your time on the weekly board.

Tips

• Corners and edges first: a corner square has only two ways in and out, so the trail has to use both.
• Never leave a single square cut off — if one has only one free neighbour left, the trail must end there, and only the last nest may.
• Look ahead to the next nest and count: you need to sweep every square on the way, not just reach it.
• Sweeping a whole row or column at a time is often the cleanest way to fill an area.
• Stuck? Cut the trail back a few squares and try the other turn — it is quicker than starting again.

Questions players ask