Complete the Arcade Mode in Multiplayer.
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You can choose to either play multiplayer locally or by teaming up with online players from the character select screen. For this trophy the difficulty level is irrelevant, just making it to the end of Level 16 is all that matters. There are ways of jumping into online games while they’re in progress, and it’s possible that you can join a game that is at the final level, beat the boss and get credit for the trophy, but I haven’t yet confirmed that.
Like the Old Days!
Complete the Arcade Mode on the hardest difficulty.
This will easily be the hardest part of your platinum, as hard mode and a set number of lives is no joke in this game. I highly recommend playing multiplayer with at least a few people who know what they’re doing, and rely heavily on sharing health and reviving players. If possible communication among the team would be a massive help, especially when it comes to health pickups or the cheer up function.
There is a way of joining other people’s online games in progress, and it’s possible that you can join a game at the last level on hard, beat the final boss and get credit
Master of One Quarter
Complete the Arcade Mode without using a credit.
, or reviving you before you lose a life. With that in mind, multiplayer with a half-decent set of partners would be your best bet.