Because we have more than one game based on David Cherkasskij Treasure Island 1988, we could make them into series. The series would be called either "Ostrov Sokrovishch", "Soviet Treasure Island" or "Doctor Livesey", whatever fits better. The another game is unofficial "Dr Livesey rom and death edition". "Treasure island 2005" would be listed as official game, "Rom and Death" as unofficial. If you know any other games about soviet treasure island, add them to the series.

https://www.speedrun.com/dr_livesey_rom_and_death_edition