astronaut-crashgame.in has been perfect for my own coffee breaks. The games load instantly and almost all of them start muted. Even if you turn on sound, it’s extremely subtle, so you won’t disturb anyone. The mini-challenges usually take less than a minute but still keep your brain lightly engaged. I especially like the visual sorting and timing games — they’re peaceful yet interesting. Since everything runs in-browser, you can open it and close it quickly without leaving traces. For quiet, short breaks, it’s an ideal match.