Gotta love how the Wii U edition somehow is limited to 864x864 worlds yet the New 3DS edition somehow supports worlds up to 2016x2016 blocks large.
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it is beacause the Wii u version is based on the "legacy console edition" developped by 4J Studios but the 3ds port is developped by an other studio that has used the mcpe (bedrock) version of the game