I get that I need to press X while holding the down button but it often just make me roll a bit forward then slow down a second later and roll in place.
1 Answer
To build up a faster boost on the starting line, you should be pressing X pretty rapidly while holding down.
This isn't explained that well in-game - I think Sonic Rivals just assumes that you're familiar with "revving" your spindash in the original games.
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