Object in variants 1 and 2: Arrange all Marbles in a horizontal or vertical row such that no Marble touches the border.
 
Click the board to drop a random set of 4 Marbles.
 
Click the border to the North, South, East or West of a Marble. The nearest Marble in the row (or column) will be shifted away from where you clicked. It will shift as far as there are positions vacant.
If it cannot move away, then it will be attracted to the border position you clicked.
The walls block the Marble movement and cannot be shifted.
 
You win if you arrange all Marbles in one consecutive line without spaces in between. Furthermore, none of these Marbles in a row of four may touch the square outer wallframe.
 
Variants 3, 4: Here the four Marbles have to be arranged in a 2x2 square. Again no Marble may touch the border.
Variants 5, 6: Played with four Marbles. They have to be arranged in a diagonal. The Marbles may touch the border in these variants.
Variants 7, 8: Like variants 5, 6, but played with five Marbles.
Variants 9, 10: Like variants 5, 6, but played with six Marbles.
Variant 11: Like variant 6, but played with seven Marbles.
Variants 12, 13: Played with four Marbles. They have to be arranged such that each one is orthogonally or diagonally adjacent to the center.
Variants 14, 15: Like variants 9, 10, but played with five Marbles.
Variants 16, 17: Like variants 9, 10, but played with six Marbles.
Variants 18, 19: Like variants 9, 10, but played with seven Marbles.
Variants 20, 21: Like variants 9, 10, but played with eight Marbles.
 
Not all setups may be solvable (however, I have not found an unsolvable example).
 
The name of the game reminds of the fact that you can only move the first Marble in any row or column.
 
 
More freeware as well as real puzzles and games at my homepage http://karl.kiwi.gen.nz.