Nick Summer Sports Stars. Hello Nickelodeon fans! Summer Olympics in Rio have already started, so our favorite Nick stars decided to start their own Olympics… Choose your favorite character and take part in one of 5 competitions. You can play solo or with up to 4 friends. Have fun! Pick your favorite Nickelodeon characters as you compete in different wacky summer sports games. This game is one of the sports games on Round Games. Enjoy and have fun in playing this free online game. Good luck.