Skill-based challenges (i.e. something you need to practice and get better at - like flash games)
Effort-based challenges (i.e. things you need to put a lot of time into - like counting to 1000 by using discord messages)
Puzzle-based challenges (i.e. challenges in which you need to strategize and think critically about how to win - like a modified chess game)
Game Strategy (making alliances, planning on who to vote out, etc)
Building relationships (talking to people to gain their trust)