SpongeBob SquarePants Return to Monster Island. SpongeBob is returning to Monster Island, but it seems like all his friends have gone missing. Take a tour, ride a creature, battle a monster in your quest to save SpongeBob’s buddies! Play Spongebob: Monster Island and Help SpongeBob to escape from the monster! This game is one of the cartoon games at Round Games. This game is one of the best SpongeBob games you can play. Enjoy and have fun in playing this free online game on Round Games and good luck.