By adding some wires and a breadboard to the Otto "Smart Expansion", I can now play games on the OLED. Thanks to @Martinez Martinez and Camilo Parra Palacio for helping me trouble shoot a coding issue. I'm using these wire connectors at the back of the expansion so that I can connect the wires between the programming board and breadboard when I want to play a game (I don't like the connectors though--they're not easy to disconnect). I disconnect them when not playing. I'm using the space where the sensor would go and keep a connector in place with a hot glue gun. 

To date I've played two games on the Otto OLED: 1) One player Pong with wiring and code courtesy of UT Source; and 2) Tic Tac Toe from giobbino. I really like this two player Pong, but (I think) that would have required a few extra wires coming out of Otto. I'm new to Otto/arduino/coding, so it's a pretty basic remix. I'd love to hear what ideas and suggestions others have to take it to the next level!

Playing Tic Tac Toe on Otto Smart Expansion
Playing Tic Tac Toe on Otto Smart Expansion
Breadboard connected to Otto via connector
Breadboard connected to Otto via connector
Wires disconnected at the back of Otto
Wires disconnected at the back of Otto