Yuki Plays Too Much Tetris or How I Learned to Stop Worrying and Love Korobeiniki was an Optional Defense Pact between the SOS Brigade and Tetris, announced 16 December 2009. It was upgraded to an MDoAP, Yuki Still Plays Way Too Much Tetris or How I Learned to Stop Worrying and Love Korobeiniki, on 26 April 2010.