Oh no, the Yellow Jogger is really small for some reason! Help him out by using the mouse! Left-click on objects like doors to interact with them. The Jogger will pick up some household items (one at a time) and carry them around. Right-click anywhere to make him drop the item. You want to guide the Jogger to the growth ray so he can unshrink himself. - [Author's description]
As a fan of early nineties PC games you played with a mouse, this thing’s pretty tight.