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Control a lymphocyte and protect the newly transplanted heart from germs trying to clog up the coronary arteries. Use SPACE to shoot antibodies at the germs.
When you've killed enough germs of one sort you can unleash the "Lymph Bath" or the "Coronary Arteries". These two special attacks help out a lot.

Don't let the green germs touch the heart, or you will lose! If the blue germs touch you, you will be slowed down.

Do not fire your antibodies at the heart.

Buy upgrades with your score after each level.

Press "Q" to change quality in the game.
Press "P" to pause the game.