All three major browsers have built-in games. Two are easy to access while the third takes a few steps. From https://lifehacker.com/how-to-unlock-hidden-browser-games-in-edge-firefox-and-1843685233:
1) Microsoft Edge:
In address/search bar, type (no spaces) edge://surf and press Enter.
2) Google Chrome:
In address/search bar, type (no spaces) chrome://dino and press Enter.
3) Mozilla Firefox: