Scout patrol secret grilles: one more CS unplugged-style activity on cryptography. - Pawel Perekietka; Agnieszka Kukla; Przemyslaw Pela (WiPSCE, 2013)

The KOALA team competition for middle schools in algorithmic puzzle-like problem solving. - Pawel Perekietka; Lukasz Nitschke; Jadwiga Jagiela; Agnieszka Kukla; Przemyslaw Pela (WiPSCE, 2014)