SuperTux is a jump'n'run game with strong inspiration from the Super Mario Bros. games for the various Nintendo platforms.

Run and jump through multiple worlds, fighting off enemies by jumping
on them, bumping them from below or tossing objects at them, grabbing
power-ups and other stuff on the way.

STORY: Penny gets captured!

Tux and Penny were out having a nice picnic on 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! I have captured your beautiful Penny and have
taken her to my fortress. The path to my fortress is littered with my
minions. Give up on the thought of trying to reclaim her, you haven't
got a chance!

-Nolok

Tux looks and sees Nolok's fortress in the distance. Determined to
save his beloved Penny, he begins his journey.