DropZone is a quickie based on the pieces of the first order square China Labyrinth.

Play DropZone interactively

Here is the board. It can either get a blue or a yellow edge, depending on which piece contacts it first. Barring that first one, pieces placed against the edge must have matching sides in either case.

Below it is a set of pieces. Each player has one and they have a fixed orientation, so they cannot be rotated. Each set is completely dual with regard to the two colours. Together the pieces of one set contain every possible combination of blue and yellow over the North, South, East and West sides.

dropzone pieces There are six types of pieces in each set: 1 four, 4 threes, 2 straight twos, 4 hooked twos, 4 ones and 1 blank, regardless of whether one looks at the blues or the yellows.

Players alternately place a piece in the right orientation on any vacant square. Pieces placed next to other pieces of either player must match in terms of colours and blanks.

The second player's first move may not mirror the first piece's pattern in a horizontal, vertical or diagonal axis, nor may it be placed in a rotational symmetric position.

Last player to make a move wins, unless the last move fills the board completely. In that case its a draw and a simultaneous solution of a puzzle.

How I invented ... DropZone

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