The best replacement for sonic adventure is sonic adventure 2.

The best alternatives to sonic adventure are rated as following:

★★★★★	sonic adventure 2
★★	sonic adventure dx
★	mario 64
★	super mario 64
★	sonic 06
	johnny

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Speaking about sonic adventure, one probably shouldn't forget about dreamcast.

Other search terms related to sonic adventure and their ratings are:

★★★★★

dreamcast

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sonic adventure

sonic adventure 2

sonic adventure dx