greenTech+ was the wining entry into the YoYo Games competition back in 2010, and has quite an oddball history. The game is designed as an old computer game (with the freeware version emulating a CRT-like stretch display), where you must lead clouds of pollution into factories for cleansing. It is fairly short, yet tremendously difficult. It is, in fact, one of my own favorite games to play, as it’s one of the few games where I don’t rely on logic or patterns for users to complete- it’s just straight up old school gameplay at it’s simplest.
The freeware version of the game eventually morphed into a PSP Minis title published by YoYo Games, available only in the EU region. That game lost a bit of it’s simple charm when it was converted to digital controls and the lack of a computer-simulated feel (the filters and such couldn’t fit into the PSP’s limited memory), but it’s still a great challenge. Eventually I converted it over to PC and gave it away with every purchase of the Oil Blue, for a limited amount of time.
You can now buy the game on it’s own for PC (complete with more levels and 3D anaglyph support), but the freeware version is still available for download. While I love the 3D effects in the commercial game (that were unfortunately cut from the PSP version) the freeware version is still plenty fun to enjoy on a lazy afternoon. Give it a try!