Rainbow Islands is a sequel to Bubble Bobble, where Bub and Bob, now small boys, aim to clean the Rainbow Islands of bad guys.
The game's objective is to ascend 4 levels on each island, with a final boss at the end. Players can trap enemies under rainbows, then jump on them to break them, collecting colored gems in the process.
Power-ups are available for extra speed and additional rainbows, adding an extra layer of strategy to the gameplay.