Fend off the attack of a mysterious bacterium that has invaded your body.

You're under attack!!!
A mysterious bacterium has invaded your body and is making its way directly to your heart. It's up to you to fend off the attack by firing an antivirus along the veins and arteries leading to your source of life. Fend off wave after wave of progressively faster, larger and mutated viri over an infinite number of varied levels always remembering to switch the type of antivirus you use. Antivirus features a high score table and save game facility.

Fire your antivirus using the 1, 2, 3, 4, 6, 7, 8 and 9 keys (you need to wait for it to recharge after each shot), use the 5 key to change the type of antivirus to match it with the virus you are blasting.