The Crew - Mission Deep Sea - card game with a simple trick taking mechanic. Difficulty is very modular as you decide a difficulty level before each game. Difficulty is decided by the numbers of missions taken and the relative complexity of those missions (this is all explained on the mission cards). Missions are based on which tricks you win, with simple rules like "I win no 1's" or "I win at least 3 9's".

Hanabi - Card playing game where you don't know your own hand. You describe aspects of each others hands (colours of cards, numbers on cards). Your goal is to place a pile of the cards 1,2,3,4,5 in each of 5 colours. Don't play with mathematicians.