Here are two puzzle games from Cornell University. They both involve diseases and viruses so they are very infectious, lol.
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Symptom
This is a unique level based puzzle game where you get to play as a deadly virus. In each level your objective is to infect a certain amount of cells and reach the end.
Symptom is a fast-paced action/puzzle game in which you control a virus fighting to take over a human host. You progress through the game by infecting and destroying cells of various colors. You can only attack a cell that you are the same color as and you become the color of the cell's nucleus. Throughout your journey you must avoid White Blood Cells. While they are slow, watch out when they begin to swarm.
Controls:
Mouse - Aim cursor/virus
W - Move towards cursor
S - Move away from cursor
A - Strafe left
D - Strafe right
Space - Launch (after infecting cell)
Esc - Pause game
Download (12.7MB):
http://symptom.freehostia.com/download.php
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Gene Therapy
This picture: [click] just about sums up the entire game. You have pieces of dna that you are trying to connect. Connecting 5 or more pairs in a chain clears the chain. The pieces you get are random so you might get unlucky and not get the pieces that you need. This game also has a short story mode where you are trying to save animals from a deadly disease (is it the same deadly virus from Symptom?).
In Gene Therapy the player takes on the role of top Critter Geneticist Dr. Vergil Hermaneutix as he tries to save his adorable friends from a mysterious disease. Simplicity rules as only simple clicks and drags of the mouse will quickly allow the player to create newly-formed DNA chains in Dr. Hermaneutix's revolutionary GH-RS system.
Beware, each critter saved leads the way to new levels with even more trouble ahead. And could it be that the lovely Nurse Jennifer Jules Beth is getting to the bottom of this disease in her confrontation with Critter Labs consultant, and buxom beauty, Dr. Morgan Catastrophe?
And, for those finished with the challenges of Story Mode, or are simply less story inclined, Challenge Mode offers all the same enjoyment of Gene Therapy but with even longer excitment: see how high you can score!
Download (28.1MB):
http://gdiac.cis.cornell.edu/showgame.php?id=GeneTherapy