my cpu messd up i cnt watch vids so idk if this is what the guy posted to begin with bt the best strat i found is to have the everything opened start off at the top of the ship when u gt bckd up take the flinger to the light house stay there til u gt bckd up make ur way to the top of the light house wait til u gt bckd up and take the zip line to the 2nd boat and when u gt bckd up there run and jump back to spawn and start all ovr again
me and my friends made it to round 24 using this strategy.
2 people are at the spawn on the island covering left and right and 2 people are at the light house on the top floor on covering window and one covering the stairs. It works really well and the only reason we died early was because we ran out of ammo. ( i know 24 isn't really high but its better than a lot of people can get.