Outside of the main campaign, a secondary multiplayer campaign is available with even more complex puzzles that will have to be completed with the help of another gamer. (gameranx.com)
The subjects of their artwork will become more recognizable as they get better at using a pencil or scissors and they'll be able to tackle more complex puzzles. (childdevelopmentinfo.com)
The premise behind this tactic is simple: administering two drugs simultaneously presents a much more complex puzzle to the parasite, dramatically reducing the chance of resilient individuals emerging. (newscientist.com)