The platform game Super Pixel on Miniclipgames is fantastic. It's a pixel art style 2D side-scroller game that's both entertaining and hard. If you've ever played Super Mario, Donkey Kong, or Sonic, you'll absolutely enjoy it. There are three stages in the game that you must complete in order to progress. Jump over obstacles, pick strawberries, and get a high score at the conclusion of each level.
Besides, if you want to play more games as enjoyable as this one, you can try out the following options: Mini Shooters and Animal Discovery Fraction Addition
Driving 
Puzzle 
Sports 
IO 
Baby 
Action 
Kids