  We introduce a game to illustrate the principles of quantum mechanics using a
qubit (or spin-first) approach, where students can experience and discover its
puzzling features first-hand. Students take the role of particles and
scientists. Scientists unravel underlying rules and properties by collecting
and analysing data that is generated by observing particles that act according
to given rules. We show how this allows one to illustrate quantum states, their
stochastic behavior under measurements as well as quantum entanglement. In
addition, we use this approach to illustrate and discuss decoherence, and a
modern application of quantum features, namely quantum cryptography. We have
tested the game in class and report on the results we obtained.
