Here is short list of cool projects that could promote robotics to kids and adults.
Real sensors, motors, buttons, wires. Users need to put and remove wires during game, and to other actions. E.g. swiping specific color card in front of sensor, or pressing button for exact number of seconds.
Mobile game that start with Scratch-like blocks, then gradually increasing involvement. Tapping on screen → require uploading source files → http api usage → running own heroku server → building cluster AI
Simple board game, where kids build robot models that could fulfill certain tasks. E.g. raising block by 20 cm; delivering cargo by 2 meters, etc.
Marble drop game combined with pinball, with no human input. Many leds, sound, screen with scores, buttons, few motors to launch balls. Controlled by arduino.
Allow people from different locations compete with each other with real physical robots.
If you decided to do any of them – let us know, and we will gladly help.