Brainuino is an open source project for developing hardware and software for intellectual games. Brainuino Aleph is a first model of game device combining timer and answer detector. See website for more details (currently in Russian only).
This project contains device firmware source code. You will need Arduino IDE or at least arduino core (libraries, avr-gcc compiler, avr-binutils and avrdude) to use it.
This project is licenced under GPLv3 or later.