Two excellent games for adults are Word UP and Roll Play. Word Up -
www.tefigames.com $33 for the classroom pack which contains 2 games boards. 12 people (6 partners) can play at a time. 5 levels of questons and 5 types of questions. My adult students LOVE playing Word Up.
Roll Play $34.95
Welcome to Dymon Publications Cards and dice - 800 different topics. I also use the cards for writing and as fill ins at the end or beginning of class.
Both games were developed for ESL Classes.
I have found a lot of good games on this website. Make enough copies so that 4 groups of 6 can play. Use anything like buttons, different colored pencil erasers, beads for the markers, or small party favors, etc. I found small dice (beads) at Hobby Lobby which work well.
And of course write your own game using this website!