Hi everyone,
Thanks to Steam's Remote Play Together you can play Raiders of the Lost Island online with friends. Only one player must own the game, and it works even if the others don't have a Steam account.
To make this even easier for you, there's a 50% OFF SALE!
More about successful raiding of the Lost Island in these tutorials, including a video about Remote Play Together setup:
https://youtube.com/playlist?list=PL7RxrbdLp0NrCVq1buMKxdU83rPb2k_Hq
To learn more amout Remote Play Together, check:
https://store.steampowered.com/remoteplay#together
Have a great day and a successful raid together with your friends!
Alex