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Dead Island Definitive Edition is coming out in just five days (May 31) on the PC, Xbox One, and PlayStation 4. This compilation includes some enhanced visuals and features for the first Dead Island, Dead Island Riptide, and includes a side-scrolling game called Dead Island: Retro Revenge. On the Xbox One, all three games are contained on one disc, as you would expect. On the PlayStation 4, you'll have to download Riptide separately.

Why?

Deep Silver provides an explanation on Twitter.
"On XB1 it is on the same disc. PS4 discs don't support multiple games, so there Riptide comes as a download code."

But wait, didn't Metro: Redux, a two-game collection that Deep Silver published, contain both games on a single disc? Yes and Deep Silver attempted to clarify their statement.
"We could've worded that better. You need a separate menu, you can't just put two games on disc the same way as on XB1."

Oh, but what about The Uncharted Collection? It seems, even though Deep Silver isn't doing a great job at making their point clear, that on the Xbox One each game will be installed separately and have their own method of launching directly from the Xbox One dashboard. I am assuming that this is where the issue arises on the PlayStation 4. I am assuming that Deep Silver wants to have each game installed separately with their own launcher on the PS4 dashboard, but are unable to do so? But that just begs the question as to why they simply didn't make a single launcher for all three games, again, like the case was with The Uncharted Collection? Perhaps it just would have been a smidgen too much work for them.