Killtendo is a game publisher who publishes games that look like ones published on Nintendo systems. They are dark side of Nintendo that gained their own identity when they published a very dark game simply called "Pokemon", which was basically Pokemon Gold version, only it had a third quest after Red was defeated, which took Gold 5 years into the future, where everything was bleak and scary. By far, the most famous game they published was one that looked like a bootleg of Donkey Kong Country 2: Diddy's Kong Quest at first glance, but was actually a new game. That game was Donkey Kong Country 2: Diddy's Rampage, a game where Diddy Kong turned evil, beat Kaptain K. Rool nearly to death, took over the Kremling Krew and became king of Krocodile Isle, resulting in Dixie and K. Rool teaming up to overthrow Diddy, travelling in grittier, darker and creepy levels, plus cursed versions of levels from DKC2. Diddy's Rampage was a big success, leading to more succesful releases.
In 2016, to commemorate the 25th anniversary of Sonic the Hedgehog, they are developing Sonic Out Of The Zone, a 2D platform game promising to be an "epic entry to the series".