Tontie is a quite simple game. It's played on a 3x3 grid and from time to time teletubbie-like critters appear. Your job is to hit them with a hammer by pressing the according key on your numeric pad.
Every new level is getting a bit more difficult. Some critters have to be hit multiple times and some must not be touched.
Those Eye-Monsters shown in the screenshot are especially confusing as you have to press their number and not the key matching their position.
You can collect coins and buy new and more powerful hammers etc. It's really a fun game.