Shrek Swamp Fun with Phonics is an educational side-scroller for kids.

As Shrek, the goal is to navigate around the Shrek-inspired swamp or castle,
jumping on ledges, and collect the appropriate item for that activity.
Curriculum covers several difficulty/skill levels, from finding all the
capital Ls and lowercase rs, to all the words that start with H or Cl, to all
three syllable words or words that come after ogre in the dictionary. If the
player collects too many wrong answers, Shrek will get tired and lie down for
a little rest.

There are also printable certificates of completion.