Solution (Destiny)

by Schedonnardus, Texas, Monday, June 22, 2015, 01:51 (3682 days ago) @ Mid7night

I saw this on reddit last week, so not my idea:

Have a card like Trials of Osiris.
After each round, you get a mark for that round.

You cannot open the chest at the end unless you have each round checked on your card.

You could join mid-way through. Maybe you need to help a friend out that had someone drop(or whatever),but unless you have all the checkpoints checked, you don't get the reward.

EDIT: forgot to add, you should be able to start a game from the last CONSECUTIVE round you've unlocked. So if you helped a friend do the last two rounds only, you would start from the beginning. But if you had done the first 3 rounds, then got disconnected/your ISP crapped out?life got in the way, then you would be able to pick up where you left off.