Monstarium

Desktop monster collection

Monstarium is a desktop idle pet game for PC, with a terrarium strip that sits along the bottom of your screen above other windows. Clicks pass through the strip to the windows behind it; only the monsters catch your mouse. They can wander off the strip and climb onto open windows, then tumble back down when you move a window.

Buy eggs and wait a minute for a monster to hatch. Drag two matching monsters together to merge them into a larger form. There are 37 evolution lines, 95 forms and five biomes to open, with new species appearing each day during your first week.