Poki

Poki features a massive collection of free mini-games.

While they might seem simple or childish at first glance, its daily active users and revenue remain consistently high.

You might also find some games surprisingly familiar, as many domestic free-to-play games copy gameplay mechanics—and even visual assets—from several game sites I've recently featured.

The games are free to play, though unlocking additional levels or items requires watching ads (if you know, you know).