Here is what you see:

• the 2 gray parallel lines designate active boundaries
• direction of the active boundary lines is parallel to axis the current figure falls;
• location of the active boundary lines is such that they minimally include current array of settled figures;
• when a figure settles down, it may drop one or more lines if it completes those such that line occupies all space between the active boundaries;
• a line to drop may be longer then the distance between active boundary lines, but it is important that the line does not have breaks between the active boundaries;
• when a figures settles down, only lines which include blocks from the figure may be dropped; all other lines remain the same even if they satisfy criteria to be dropped;
• only serious players allowed to play this game!

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