Atlantis is a marble-popping game. Move your mouse left or right to aim the launcher and press the button to fire. You must complete rows of three or more of the same colored marbles to clear them. You must clear all marbles before they reach the exit or you will lose a life. If you lose all your lives,. the game is over. The launcher holds two balls at the same time and these can be swapped, if you wish.
Occasionally, a bonus is released. These can stop, slow or reverse the line, destroy several marbles at once, give you aiming help, etc. Some marbles have undecorated sides. These will gain you credits. After each level, you can use these credits, if you have enough, to purchase bonuses or extra lives. To use a purchased bonus, just press the enter/return key.