Find

They overlap heavily. Hidden object games usually give you a list to work through in an illustrated scene, while find games also cover spot-the-difference and single-target searches that don't use a list at all.

Find The Pets. Each round is short, the goal is obvious immediately, and there is nothing to learn before you start looking.

You get two near-identical images and have to find what changed between them. Italian Brainrot Find the Difference is the version here, and the trick is scanning systematically rather than staring at the middle.

Depth. Objects can sit behind one another rather than being flat on a page, so you rotate and look around the pile instead of scanning a single fixed image.

Yes, all of them run free in your browser with nothing to install and no account needed before you start looking, on a desktop or a phone.