Wikipedia
Játékok
Játékok (Hungarian: Games) is an ongoing collection of "pedagogical gperformance pieces" by György Kurtág. He has been writing them since 1973. Eight volumes had been published as of 2010 (by Editio Musica Budapest). Volumes I, II, III, V, VI and VII are for piano solo. Volumes IV and VIII are for piano 4-hands or two pianos.
Volume I was essentially completed in 1973 but not published until 1979, by which time Volumes II, III and IV had also been composed. Volumes V and VI were published in 1997, Volume VII in 2003.
Several pieces from the collection have started to be regularly performed, including a Prelude and Chorale, an Antiphon in F Sharp, and a piece called 3 in memoriam. Cataloging is not as transparent as it might be.