氪肝

(slang) to put in long hours, typically late into the night, playing a video game (rather than pay for power-ups)

krypton (chemistry)

liver / CL:葉|叶[ye4],個|个[ge4] / (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