Penny gets captured!
Tux and Penny were out having a nice picnic in the ice fields of Antarctica. Suddenly, a creature jumped from behind an ice bush, there was a flash, and Tux fell asleep!
When Tux wakes up, he finds that Penny is missing. Where she lay before now lies a letter. "Tux, my arch enemy!" says the letter, "I've captured your beautiful Penny and have taken her to my fortress. Give up the thought of trying to rescue her, you haven't a chance!" - Nolok
Tux looks and sees Nolok's fortress in the distance. Determined to save his beloved Penny, he begins his journey.
Super Tux is an excellent 2D platform game that also includes a construction kit.