What is WaHoKe? It is just abbreviation for WAreHOuse KEeper. And "warehouse keeper" is just translation of the Japanese word sōkoban (倉庫番).
But what the sokoban is?
Sokoban is a type of transport puzzle, in which the player pushes boxes or crates around in a warehouse, trying to get them to storage locations. Idea of this game was created in 1981 by Hiroyuki Imabayashi.
The game is played on a board of squares, where each square is a floor or a wall. Some floor squares contain boxes, and some floor squares are marked as storage locations.
The player is confined to the board, and may move horizontally or vertically onto empty squares (never through walls or boxes). The player can also move into a box, which pushes it into the square beyond. Boxes may not be pushed into other boxes or walls, and they cannot be pulled. The puzzle is solved when all boxes are at storage locations.
In this version there are more than 600 levels. But don't think what it isn't too much. Levels are tough. Yes, levels are really difficult. Don't think what they can be solved in seconds. Despite the small size of the levels it should take 30-40 (logical) moves to solve every map.