Trivia
The development of Tajemství Oslího ostrova started after two students of the same high school - Jarek Kolář and Petr Vlček first met. They worked on the game for fun and only in their free time. The programmer coded the whole game on a school's computer because he didn't have his own. After two years of development they contacted Petr Vochozka (the only one Czech publisher of games at those times) and signed a publishing deal with him.
On June 20, 2000 (exactly 6 years after its first release) Tajemství Oslího ostrova was released free exclusively on Czech gaming site BonusWeb.
First Czech commercial game for PC.