Spectrum: an educational computer game

The absorption and emission spectra of the hydrogen atom are explained through a computer game. The idea of electronic energy levels (quantization) is introduced by using the idea of the `right photon' to excite an electron. The software includes many important concepts such as mean lifetime, electrons, photons, spectra, ionization, etc. Deeper information is also available. The game is being tested and can be played in Universum, the Science Museum of the Universidad Nacional Autónoma de México.