氪肝

氪肝	kè gān	(slang) to put in long hours, typically late into the night, playing a video game (rather than pay for power-ups)
氪	kè	krypton (chemistry)
肝	gān	liver (CL:叶) / (slang) to put in long hours, typically late into the night, playing (a video game) / (of a video game) involving a lot of repetition in order to progress; grindy