Strategic games are perfect for people looking for a challenge.
7 Wonders
Acquire
Among Thieves
Catan
Chess
Citadels
Diplomacy
Dominion
Harry Potter Hogwarts Battle
Lords of Waterdeep
Marvel Uncanny X-Men Dice Masters
Pandemic
The Return of the King Deck Building Game
Revolution
Road to Enlightenment
San Juan
Shogunate
Small World
Smash Up
Splendor