Hapland 3

Hapland 3 was a puzzle game from the Flash era. It came out in 2007, made by Sean O'Connor. You would find it on sites like Kongregate, a small window of simple graphics and quiet music that could keep you stuck for hours.

You control a cursor, clicking on everything you see. Your goal is to open a portal by solving a chain of environmental puzzles. You might click a rock to start an avalanche, which then frees a character, who then walks to a lever. The puzzles are interconnected; one action in the forest can affect something in the distant castle. The game is slow and difficult, with no hints beyond your own trial and error. It feels like carefully setting up a row of dominoes, then watching the whole sequence finally click into place.