Look for games that load under 3 seconds, play well with a single hand, and have restart loops under 2 seconds. Pixel-art titles age well and run on low-end hardware. Check itch.io’s HTML5 tag and browser-game subreddits.
1. Slither.io
Still addictive, Slither.io continues to dominate the casual scene.
2. Krunker.io
A lightweight FPS that runs smoothly on almost any device.
3. Little Alchemy 2
Create endless combinations and discover fun items.
...and many more!