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A mix of easy, medium and hard — questions run from warm-up to expert, so there's a real challenge at every level. Think you know the answers? Play to find out.
This thinker, forced to drink hemlock in 399 BCE, never wrote down his teachings but influenced Western thought through his famous student's dialogues.
Difficulty: EasyThis branch of Buddhism uses tantric practices, mantras, and visualizations, and is prominent in Tibet and Mongolia.
Difficulty: MediumCatherine Elgin argues that scientific understanding can involve representations that are literally false but nonetheless epistemically valuable because they exhibit this property.
Difficulty: HardThe philosophical view that only the mind and mental states truly exist, and physical matter is either an illusion or dependent on minds.
Difficulty: EasyThis concept in Eastern philosophy refers to the cycle of death and rebirth that souls undergo.
Difficulty: MediumThis 17th-century English republican argued that civic virtue requires citizens to bear arms and maintain a militia.
Difficulty: HardThis ancient Greek philosophy, founded in Athens around 300 BCE, taught that virtue is the highest good and that we should focus only on what we can control.
Difficulty: EasyThis problem from a dialogue on piety asks whether the gods love what is holy because it is holy, or whether holiness is simply whatever the gods happen to love.
Difficulty: Medium