If you've played other tap-to-escape games, Fish Escape will feel familiar for about eight levels, and then a fish will refuse to leave through a lane that looks completely empty. That lane isn't empty. It has seaweed in it — the wake left behind by a fish you freed earlier — and seaweed is a wall. This single rule is the reason Fish Escape is a sequencing puzzle rather than a tapping exercise, and this guide is about reading it.
When you tap a free fish, it swims in the direction it faces until it exits the tank. Every cell it passes through on the way out — from the cell in front of its nose to the edge — fills with seaweed. The cells the fish itself occupied are left empty. Seaweed never clears. Fish cannot swim through it, and the hint system treats it exactly like a rock.
Two details matter more than they seem. First, the wake is only laid in the lane ahead of the fish, never behind it, so a fish whose nose is already touching the wall leaves no wake at all. Second, the wake is laid along the fish's own row or column — never diagonally and never sideways — so you can always predict exactly which cells it will cover before you tap.
Picture one row of a tank with two fish both facing right: fish A in column 1 and fish B in column 3, with the wall at column 5. Both lanes are clear, so both are free right now.
Free A first and it swims through columns 2, 3 — wait, column 3 has fish B in it. A is not actually free; the scan would have caught that. So the only legal first move is B. B swims out through column 4 and leaves seaweed in column 4. Now A's lane is columns 2, 3, 4 — and column 4 is seaweed. A is stuck forever. The level is lost with two taps, no hearts spent, and every tap "legal".
The lesson is that the wake is a trap precisely in the situation that looks safest: two fish pointing the same way down one lane. The only way to clear both is for the one closer to the wall to go first and for its wake not to cover the other's path — which, in a single shared lane, is impossible. A tank designer who wants to be cruel puts two same-facing fish in one lane and gives one of them a second way out: a different lane that opens once a third fish moves. Finding that third fish is the puzzle.
Now picture a fish facing up in column 2 and a fish facing right in row 2, with their lanes crossing at the cell (row 2, column 2) — which is empty. Both are free. Whichever you free first lays seaweed across that crossing cell and blocks the other. There is no order that saves both, unless one of them is already past the crossing. Count the cells: if the up-facing fish sits in row 1, its lane to the top wall never touches row 2, and both can leave in either order. If it sits in row 3, its lane passes through row 2 and the crossing is live.
Crossings are where most mid-game levels hide their solution. The habit to build: for every pair of free fish, check whether their lanes share a cell. If they do, one of them has to wait for the other lane to be cleared some other way — usually by a fish you haven't looked at yet.
The wake isn't only a hazard. Because seaweed is a wall, it can also be a shield. Suppose a fish facing down would, on leaving, lay seaweed across a cell that you'd otherwise have to worry about — say, a cell that a long fish needs to slide through later. Nothing is lost; the long fish was never going that way. But suppose instead that the seaweed will land next to a fish you intend to free last, in the lane it does not use. Then the wake costs nothing, and you've simplified the board for free.
Advanced players plan their last two or three moves first: "fish X must leave last, through its own column, so I must never lay seaweed in that column — everything else is fair game." Working backwards from the hardest fish, rather than forwards from the easiest, is how the later levels are meant to be solved.
Four questions, two seconds each. On the levels that matter they are the entire game. For the broader habits — scanning the edges, counting lanes, never tapping on hope — read How to solve unblock puzzles; for the moments when the checklist leaves you with no move at all, there's Stuck on a level?
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