These kind of games are very easy to add, some examples are
- Tic Tac Toe, very simple
- Checkers/Chess, Chess is a maybe
- Connect 4, With sand and gravel
- Monopoly, maybe a bit tricky to add
- SORRY, that game where you slide things into others things
- Chutes and Ladders
- Pictionary, this is possible as I've seen it on another server
- Game of Life
- Head Banz, other people describe what thing is on your head and you have to guess
- Operation
- Yatzee
And some others that could be Short and Simple to add.