Some Ubisoft's PS4 games will not work on PS5, including

Assassin’s Creed Syndicate and Assassin’s Creed Chronicles are among the few Ubisoft titles that will not make the leap to Playstation 5.

Ubisoft: Sony Playstation 5 will support PS4 games only

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AC UNITY // Requesting Ubisoft to tweak the game on PS5 : r/playstation

Here Are the Games Coming to Ubisoft's Subscription Service

Some Ubisoft's PS4 games will not work on PS5, including Assassin's Creed titles - Polygon

Ubisoft Says PS5 Backwards Compatibility 'Almost All Back Catalog' of Previous Consoles

Far Cry 6 Standard Edition for PS4 and PS5

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Prince Of Persia The Lost Crown - Playstation 5 : Target