Emanuele Feronato has released the source for a Phaser prototype of the puzzle game zNumbers: "I am sure you don’t know the clever puzzle game zNumbers by Karl Bartel. It was originally published for the Sharp Zaurus and no, don’t ask me what it is.
You play in a 6×6 grid, filled with numbers from 1 to 4. Every tile with a number can be moved horizontally, vertically or diagonally. The number on the block indicates how far the block must be moved. Other blocks between the start and destination don’t prevent a movement, but the destination field must be free. All possible destinations are highlighted when you select a block."