Robot Unicorn Attack will forever hold a special place in my heart. I remember PAX East 2010, meeting many Dtoiders for the first time, and joining a rousing drunken chorus of Erasure's "Always" in the late hours of the evening. I have an auto-runner Flash game featuring the heavenly music of a British synthpop band to thank for that.
Publisher Adult Swim Games knew it had a hit on its hand and did what any company in possession of a deliriously hot property would do: rehash the mother-loving piss out of it. There are no less than five variants of Robot Unicorn Attack on the Adult Swim game portal, each identical to the original aside from a graphical re-skin and other infinitesimal changes. It became the Oreo cookie of browser games, re-surfacing every few months with a different seasonal creme filling color (yeah, I know distinct Oreo creme flavors exist, but I'm trying to make a point here).
Robot Unicorn Attack 2 takes that famous Oreo flavor and makes a slamming Oreo milkshake, a concoction far greater than the sum of its parts. All the fun, all the magic, all the sugary sweetness, all the dolphins, now as a frosty beverage!