Ok, I will try once again and be the devil's advocate I found a solid reason how one possible can make 3 Tetris movies, which also have sci-fi triller Theme.
Most people forgot that most arcade games had somekind of backstory from each of their game written mostly into their Arcade flyers or if their manuals to make the players care while they are playing.
Tetris had an interesting plot in some specific manuals:
Tetris Worlds for PS2
http://gamesdbase.com/Media/SYSTEM/Sony_Playstation_2/manual/Formated/Tetris_Worlds_-_2002_-_THQ,_Inc..pdf
In this game tell the story of Tetrions, gateways to other orbit planets controled by a intelligent Alien Race. Minos are the aliens which are the most intelligent species in the Galaxy which know the secrets of Tetrions. They are the "Tetrinauts"!!!
Their mission is to evacuate as many Minors as possible because their home planet [Hadar 4] is unstable and it will be destroyed after some years.
With this above I guess at least for the first movie of the Trilogy will be about the Minos trying to open the Gateway which connect Earth and Hadar 4.
Cool story I guess. What do you think?