Some articles on dogic, dogics:

Dogic - History
... The Dogic was patented by Zoltan and Robert Vecsei in Hungary on 20 October 1993 ... It was originally sold by VECSO in two variants under the names "Dogic" and "Dogic 2", but was only produced in quantities far short of the demand for a long time, the only feasible way to acquire it was via ... at the request of puzzle fans and collectors worldwide, and made another production run of the Dogics ...