Bubble Bobble also featuring Rainbow Islands

Bubby & Betty and Bobby & Patty are lovers who have pledged their futures to each other. In the village where they live there is a terrifying "Wizards' Wood" - the people of the village are too frightened even to approach it.
The four of them drifted into this wood one day by mistake. Oh no. The wizards turned the boys into bubble-blowing dinosaurs, and dragged the girls off to a cave 100 floors under the earth.
Despite being in dinosaur form, the boys bravely forged their way into the caves in an attempt to rescue the girls. So how does the story end? That's for you to find out..
Once you've chosen Bubble Bobble, you will see the Main Menu, featuring these choices: Start game, Options and Quit game. Highlight your choice and press the start button.
You blow green or blue bubbles and trap the enemies inside them, then burst these with your horns or spines to kill the enemies. The object of the game is to clear all 100 rounds. As you progress, you wll be pursued by an ever-increasing cast of troublemakers intent on destroying you. You need to be quick-witted and bold, with lightning reflexes. There are hidden levels, enemies and pick ups.

What is abandonware ?