Fish Sokoban

A free online Sokoban box pushing puzzle

Fish Sokoban turns the small warehouse puzzle into an underwater cargo run. The fish keeper moves between coral walls, wooden cargo crates replace the boxes, and shell markers show each destination.

Every action still follows the same box pushing rules: move one square at a time, push one box into an empty square, and finish when all boxes are on goals. A box cannot be pulled, pushed through a wall or pushed through another box.

How to play Fish Sokoban

Guide the fish with the arrow keys or WASD. On a touch device, use the direction buttons beneath the board. A crate moves only when you swim into it and the space on its far side is clear.

The HUD records successful moves and pushes. Bumping a wall or blocked box does not add a move. There is no timer or move limit; you can pause to plan where the keeper needs to stand for the next push.

Six fixed Sokoban levels to study

Choose any board from the Level menu: First push, Two rooms, Around the pillar, Pair, Storage row or The hook. All six are available immediately and every player receives the same maps.

These are six bundled miniature puzzles, not a daily seed or a server-generated level feed. The first board teaches a single push; later boards add route planning, pillars, multiple boxes and a narrow hook-shaped arrangement.

Undo manual moves and reset a board

Undo returns to the previous manual move snapshot. Reset restores the selected level to its starting layout and clears that board’s move history. You can also choose another level without completing the current one.

Solve animation steps do not add entries to the original manual Undo history. After an assisted solve, Undo therefore returns to the last manually recorded position, rather than reversing each automatic step; the move counters retain the source game’s behavior.

Dead squares and Sokoban strategy

Use the Dead squares checkbox to mark positions from which a box can never reach a goal. The original analysis starts at the goals and works backward with a reverse pull search before play or solving.

Avoid pushing a box into an unmarked wall corner unless that corner is a goal. Keep routes behind boxes open, and work out where the keeper will stand before committing a push. The overlay identifies static dead squares; other arrangements of several boxes can still block one another.

Watch the original push-optimal BFS solver

Solve (BFS) searches from your current position. It finds a solution with the fewest pushes, then animates the keeper’s walking route and the required pushes. Fewer pushes does not necessarily mean the fewest walking moves.

The source solver stops after its search budget if it cannot finish the search. A proven deadlock is reported separately from reaching that budget. The animated solution can be paused with the game host; reloading restores the current board and the remaining valid animation steps. A completed automatic solution is practice: it pauses active-play timing and does not count as a natural win or a loss. Reset clears assistance for a fresh attempt.

Browser progress and account checkpoint saving

Save keeps the selected level, board, moves, pushes, manual history, Dead squares setting and any unfinished Solve route. Refresh resumes the same compatible checkpoint. Opening Save options pauses movement and the solver animation until the dialog closes.

When the FoolFish host provides a signed-in account save connection, the whole checkpoint can sync to that account. If another device has newer progress, choose which board to keep. The editions and guest or account profiles keep separate progress. A very long move history can exceed the checkpoint limit: a failed save keeps the earlier checkpoint without trimming your moves, and Save options stays open. Close it to keep playing, or Reset for a fresh attempt.

Explore more logic and box pushing games

Guide the fish between the crates while keeping a clear route behind every crate you still need to push. Reef corners can trap a crate just as walls do, so check the shell goals before committing to a push. Use Undo to compare another route, or Reset when you want a fresh attempt.

Sokoban uses the same six layouts, box pushing rules and solver with another visual theme. Sliding Puzzle asks you to rearrange numbered tiles around one empty space, while Water Sort focuses on moving matching liquid colors between containers. Browse logic puzzles when you want another challenge in planning moves.

Learn Sokoban with a single push

Fish Sokoban opens on a tiny box-pushing puzzle. Press Right or use the on-screen right arrow to push the box onto its goal. Once you finish, choose Next puzzle for an easy one-box layout, then progress to puzzles that ask you to coordinate more than one box.

Leave room to get behind the box

You can push a box but cannot pull it back. Before moving, check whether you will still be able to walk around it and reach the side needed for the next push. A wall or corner can stop a box from ever reaching its goal, even when the first move looked useful.

FoolFish Games presents this Sokoban online game as a compact sequence of puzzles, with the first move ready when you enter. For another spatial challenge without a separate game download, try Tangram, or explore the Chromebook games collection.