"Ultimate Flash Sonic"
This cool jump and run platform game is one of the best free online Sonic Games.
Play as Sonic Hedgehog, Tails, Knuckles or Cream and collect rings on your way through fun jump and run levels filled with surprises and monsters. Play the main game or the time trial.
Use left and right arrow to move and run, press space to jump. Spindash by holding down arrow, pressing space and then releasing down. Press enter to pause the platform game.
You can also play Mario Games at Juggernart:
Marios Adventure 2
Mario Forever Flash
Mario Star Scramble 2