XCOM: Enemy Unknown
XCOM: Enemy Unknown is one of the most fun and equally frustrating Turn Based Strategy games released in recent years. It places you as Commander of a secret military organization that was put together in case of an alien invasion. Leaving you to your own mental fortitude to build your base, manage your resources, create and rank up your soldiers, and decide which missions have priority. It has an incredibly fun soldier customization feature that allows you to name, shape, and equip your soldiers. This causes many stressful hours of trying to keep your friends alive, failing, and always feeling really guilty when you see them in person. XCOM also has a permadeath system which makes every battle that much more intense. Plus, you can virtually play any campaign forever making this an incredibly addicting, mentally taxing game that will hit the full spectrum of emotions.